#!/bin/python3

import sys

if __name__ == "__main__":
    n = int(input().strip())
    table = [[-1 for _ in range(n+1)]for _ in range(n+1)]
    i_start, j_start, i_end, j_end = input().strip().split(' ')
    i_start, j_start, i_end, j_end = [int(i_start)+1, int(j_start)+1, int(i_end)+1, int(j_end)+1]
    #n = 3*n
    #if n < 21:
    n = 21
        
    '''else:
        temp = 1
        while 4*temp+1 > n:
            temp += 1
            
        n = 4*temp+1'''

    
    
    
    mid = n//2 + 1
    diffx = mid-i_start
    diffy = mid-j_start
    i = mid
    j = mid
    endi = i_end+diffx
    endj = j_end+diffy
    ans = 0
    rb_diagonal = []
    '''for i in range(1,n//2):
        rb_diagonal.append((11+2*i,11+i))
    print(i,j)
    print(endi,endj)'''
    if endi%2 == 0 or (endi%2 != 0 and (endi-1)%4 == 0 and endj%2 != 0) or (endi%2 != 0 and (endi-1)%4 != 0 and endj%2 == 0):
        print("Impossible")
        
    else:
        if i == endi and j == endj:
            print(0)
            
        elif i == endi and j != endj:
            if endj > j:
                ans = abs(endj-j)//2
                print(ans)
                print("R "*ans)
                
            else:
                ans = abs(j-endj)//2
                print(ans)
                print("L "*ans)
                
        elif i != endi and j == endj:
            if i > endi:
                ans = abs(i-endi)//4
                print(2*ans)
                print("UL UR "*ans)
                
            else:
                ans = abs(endi-i)//4
                print(2*ans)
                print("LR LL "*ans)
                
        else:
            if endi < i and endj < j:
                Str = ''
                rdiff = abs(i-endi)
                N_ul = rdiff//2
                ans += N_ul
                cnew = abs(j-N_ul)
                Str += "UL "*N_ul
                if cnew >= endj:
                    cdiff = abs(cnew-endj)
                    N_l = cdiff//2
                    ans += N_l
                    Str += "L "*(N_l)
                    
                    print(ans)
                    print(Str)
                    
                else:
                    cdiff = abs(endj-cnew)
                    N_r = cdiff//2
                    ans += N_r
                    Str += "L "*(N_r)
                    
                    print(ans)
                    print(Str)    
                
            elif endi < i and endj > j:
                Str = ''
                rdiff = abs(i - endi)
                N_ur = rdiff//2
                ans += N_ur
                cnew = i+N_ur
                Str += "UR "*N_ur
                if cnew >= endj:
                    cdiff = abs(cnew-endj)
                    N_l = cdiff//2
                    ans += N_l
                    Str += "L "*(N_l)
                    print(ans)
                    print(Str)
                    
                else:
                    cdiff = abs(endj-cnew)
                    N_r = cdiff//2
                    ans += N_r
                    Str += "R "*(N_r)
                    print(ans)
                    print(Str)
                
            elif endi > i and endj < j:
                if (endi-i)//2 > j-endj:
                    ti = endi
                    tj = endj
                    count = 0
                    while (ti-i)//2 != tj-j:
                        count += 1
                        ti -= 2
                        tj += 1
                       
                    Str = ''
                    N_lr = (ti-i)//2
                    N_ll = count
                    Str += "LR "*N_lr
                    Str += "LL "*N_ll
                    ans += N_lr+N_ll
                    print(ans)
                    print(Str)
                    
                    
                    
                else:
                    rdiff = abs(endi - i)
                    N_ll = rdiff//2
                    ans += N_ll
                    cnew = abs(j-N_ll)
                    Str += "LL "*N_ll
                    if cnew >= endj:
                        cdiff = abs(cnew-endj)
                        N_l = cdiff//2
                        Str += "L "*N_l
                        ans += N_l

                        print(ans)
                        print(Str)

                    else:
                        cdiff = abs(endj-cnew)
                        N_r = cdiff//2
                        Str += "R "*N_r
                        ans += N_r

                        print(ans)
                        print(Str)

            else:
                if (endi-i)//2 > endj-j:
                    Str = ''
                    count = 0
                    ti = endi
                    tj = endj
                    while (ti-i)//2 != tj-j:
                        count += 1
                        ti -= 2
                        tj += 1
                        
                    N_lr = (ti-i)//2
                    N_ll = count
                    Str += "LR "*N_lr
                    Str += "LL "*N_ll
                    ans += N_lr+N_ll
                    print(ans)
                    print(Str)   
    
                else:     
                    rdiff = abs(endi - i)
                    N_lr = rdiff//2
                    cnew = j+N_lr
                    Str = ''
                    ans += N_lr
                    
                    
                    cdiff = abs(cnew-endj)
                    N_r = cdiff//2
                    Str += "R "*N_r
                    Str += "LR "*N_lr
                    ans += N_r

                    print(ans)
                    print(Str)