#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,rmov=0,cmov=0,step=0, ri,ci,rf,cf;cin>>n>>ri>>ci>>rf>>cf;
    int chanr=abs(ri-rf), chanc=abs(ci-cf);
    string s;
    if(chanr%2!=0){cout<<"Impossible"<<endl;return 0;}
    if(chanc==0&&chanr%4!=0){cout<<"Impossible"<<endl;return 0;}
    if(chanr==0&&chanc%2!=0){cout<<"Impossible"<<endl;return 0;}
    if(chanr==0&&(ci>cf)){
        step+=(ci-cf)/2;cout<<step<<endl;
        while(step--)cout<<"L"<<" ";
        return 0;
    }
    if(chanr==0&&(cf>ci)){
        step+=(cf-ci)/2;cout<<step<<endl;
        while(step--)cout<<"R"<<" ";
        return 0;
    }
    if(chanc==0&&chanr%4==0&&(rf>ri)){
        step+=(rf-ri)/2;cout<<step<<endl;step/=2;
        int cp=step;
        while(step--)cout<<"LR"<<" ";
        while(cp--)cout<<"LL"<<" ";
        return 0;
    }
    if(chanc==0&&chanr%4==0&&(ri>rf)){
        step+=(ri-rf)/2;cout<<step<<endl;step/=2;
       int cp=step;
        while(step--)cout<<"UL"<<" ";

        while(cp--)cout<<"UR"<<" ";
        return 0;
    }
    if(chanr%2==0)
    {
        if(rf<ri&&cf<ci)
        {
           cmov+=(abs(rf-ri))/2;step+=cmov;
           chanc=abs(chanc-cmov);
           if(chanc%2==0){step+=chanc/2;
           cout<<step<<endl;
           while(cmov-->0){
            cout<<"UL"<<" ";ci--;
           }
           chanc/=2;
          if(ci>cf)while(chanc-->0){cout<<"L"<<" ";}
          else {while(chanc-->0){cout<<"R"<<" ";}}
        }else cout<<"Impossible"<<endl;
        }
        else if(rf<ri&&cf>ci)
        {
           cmov+=(abs(rf-ri))/2;step+=cmov;
           chanc=abs(chanc-cmov);
           if(chanc%2==0){step+=chanc/2;
           cout<<step<<endl;
           while(cmov-->0){
            cout<<"UR"<<" ";ci++;
           }chanc/=2;
           if(ci<cf)while(chanc-->0)cout<<"R"<<" ";
           else{while(chanc-->0)cout<<"L"<<" ";}
        }else cout<<"Impossible"<<endl;
        }
        else if(rf>ri&&cf>ci)
        {
           cmov+=(abs(rf-ri))/2;step+=cmov;int pv=cmov;
           chanc=abs(chanc-cmov);
           if(chanc%2==0){step+=chanc/2;
           cout<<step<<endl;
           while(cmov-->0){
            //cout<<"LR"<<" ";
            ci++;
           }chanc/=2;
           if(ci<cf){

                while(chanc-->0)cout<<"R"<<" ";
           while(pv-->0){
            cout<<"LR"<<" ";
           // ci++;
           }  }
           else{while(chanc-->0)cout<<"L"<<" ";}
        }else cout<<"Impossible"<<endl;
        }
       else  if(rf>ri&&cf<ci)
        {
           cmov+=(abs(rf-ri))/2;step+=cmov;int pv=cmov;
           chanc=abs(chanc-cmov);
           if(chanc%2==0){step+=chanc/2;
           cout<<step<<endl;
           while(cmov-->0){
           // cout<<"LL"<<" ";
            ci--;
           }
           chanc/=2;
           if(cf<=ci){while(chanc-->0)cout<<"R"<<" ";
           while(pv-->0){
            cout<<"LL"<<" ";
            //ci--;
           }
           }
          else {while(chanc-->0)cout<<"L"<<" ";}

        }else cout<<"Impossible"<<endl;
        }
    }
}