#include<bits/stdc++.h>
using namespace std;
int main()
{
  int ar[10001];
  int n,a,b,c,d,i=0,count=0;
  cin>>n>>a>>b>>c>>d;
  if(c>n || d>n || c<0 || d<0)
  {
    cout<<"Impossible"<<endl;
  }
  else if((c-a)%2!=0)
  {
    cout<<"Impossible"<<endl;
  }
  else if(c==a && (d-b)<=1 && (d-b)>=-1)
  {
    cout<<"Impossible"<<endl;
  }
  else{
    if(((c-a)/2)%2==0 && (d-b)%2!=0)
      cout<<"Impossible"<<endl;
    else if(((c-a)/2)%2!=0 && (d-b)%2==0)
      cout<<"Impossible"<<endl;
    else{
      while(a>c)
      {
        if(b>=d && b>0)
        {
          a-=2;
          b-=1;
          ar[i]=1;
          i++;
          count++;
        }
        else
        {
          a-=2;
          b+=1;
          ar[i]=2;
          i++;
          count++;
        }
      }
      while(a<c)
      {
        if(b<=d && b<n-1)
        {
          a+=2;
          b+=1;
          ar[i]=4;
          i++;
          count++;
        }
        else
        {
          a+=2;
          b-=1;
          ar[i]=5;
          i++;
          count++;
        }
      }
      while(b<d)
      {
        b+=2;
        ar[i]=3;
        i++;
        count++;
      }
      while(b>d)
      {
          b-=2;
          ar[i]=6;
          i++;
          count++;
      }
      for(int ii=1;ii<count;ii++)
    {
      int data=ar[ii];
      int jj=ii-1;
      while(jj>=0 && ar[jj]>data)
      {
        ar[jj+1]=ar[jj];
        jj--;
      }
      ar[jj+1]=data;
    
    }
    cout<<count<<endl;
      for(int j=0;j<count;j++)
      {
        if(ar[j]==1)
          cout<<"UL"<<" ";
        else if(ar[j]==2)
          cout<<"UR"<<" ";
        else if(ar[j]==3)
          cout<<"R"<<" ";
        else if(ar[j]==4)
          cout<<"LR"<<" ";
        else if(ar[j]==5)
          cout<<"LL"<<" ";
        else if(ar[j]==6)
          cout<<"L"<<" ";
      }
    }

  }
  return 0;

}