#include <bits/stdc++.h>
using namespace std;
int main() {
    int n;
    cin >> n;
    int i_start;
    int j_start;
    int i_end;
    int j_end;
    cin >> i_start >> j_start >> i_end >> j_end;
    int x= abs(i_start- i_end);
    int y= abs(j_start- j_end);
    int rx= i_end- i_start;
    int ry= j_end - j_start;
    if(x%2==1){
        cout<<"Impossible"<<endl;
    }
    else{
        int p= x/2;
        if(p%2==1 && abs(y-1)%2==1)
            cout<<"Impossible"<<endl;
        if(p%2==0 && abs(y)%2==1)
            cout<<"Impossible"<<endl;
        else{
            int l=0,r=0;
            int ul=0,ur=0,dl=0,dr=0;
            if(y >= x/2 ){
                if(ry >= 0){
                    r+= (y-x/2)/2;
                }
                else{
                    l+= (y-x/2)/2;
                }
                if(rx >=0){
                    if(ry>=0)
                        dr+= p;
                    else{
                        dl+=p;
                    }
                }
                else{
                    if(ry>=0)
                        ur+= p;
                    else{
                        ul+=p;
                    }
                }
            }
            else{
                if(rx >= 0){
                    //dl + dr= p;
                    //dr - dl = ry;
                    dr = (p + ry)/2;
                    dl = p - dr;
                }
                else{
                    ur =(p+ ry)/2;
                    ul = p - ur;
                }
            }
            cout<<(l+r+ul+dr+ur+dl)<<endl;
            for(int i=0;i<ul;i++){
                cout<<"UL ";
            }
            for(int i=0;i<ur;i++){
                cout<<"UR ";
            }
            for(int i=0;i<r;i++){
                cout<<"R ";
            }
            for(int i=0;i<dr;i++){
                cout<<"LR ";
            }
            for(int i=0;i<dl;i++){
                cout<<"LL ";
            }
            for(int i=0;i<l;i++){
                cout<<"L ";
            }
        }
    }
    return 0;
}