#include<bits/stdc++.h>
using namespace std;
vector<string> s;
int n,m;
int  shortest( int is,int js,int ie, int je)
{ if(is>n-1||js>n-1||is<0||js<0) return 0;
  else if(is==ie&&js==je) return 1 ;
  else if(ie==is&&abs(je-js)==1) return 0;
  else if(je==js&&abs(ie-is)==1) return 0;
  else if(abs(je-js)==1&&abs(ie-is)==1) return 0;
  else if(je==js) {if(ie<is) {if (shortest(is-2,js+1,ie,je)) {s.push_back("UR");return 1;} else return 0;}  else {if (shortest(is+2,js+1,ie,je)) {s.push_back("LR");return 1;} else return 0; }}

  else if(ie==is) {if(je>js) {if((je-js)%2==0) {m=je-js; while(m-1) {s.push_back("R");m=m/2;} return 1;} else return 0; } else {if((js-je)%2==0) {m=js-je;while (m-1) {s.push_back("L");m=m/2;} return 1;} else return 0; } }
  else if(abs(ie-is)>abs(ie-is+2)&&abs(je-js)>abs(je-js+1)) {if  (shortest(is-2,js-1,ie,je) ) {s.push_back("UL");return 1;} else return 0;}

  else if(abs(ie-is)>abs(ie-is+2)&&abs(je-js)>abs(je-js-1)) {if (shortest(is-2,js+1,ie,je)) {s.push_back("UR");return 1;} else return 0;}

  else if(abs(je-js)>abs(je-js-2)) {if (shortest(is,js+2,ie,je))   {s.push_back("R");return 1;} else return 0;}

  else if(abs(ie-is)>abs(ie-is-2)&&abs(je-js)>abs(je-js-1)) {if (shortest(is+2,js+1,ie,je)) {s.push_back("LR");return 1;} else return 0;}

  else if(abs(ie-is)>abs(ie-is-2)&&abs(je-js)>abs(je-js+1)) {if (shortest(is+2,js-1,ie,je)) {s.push_back("LL");return 1;} else return 0;}

  else if(abs(je-js)>abs(je-js+2)) {if (shortest(is,js-2,ie,je))   {s.push_back("L");return 1;} else return 0;}

  else return 0;

}
int main()
{  int i=0,is,js,ie,je;
 cin>>n;
 cin>>is>>js>>ie>>je;
i=shortest(is,js,ie,je);
if(i==0) cout<<"Impossible";
else{
cout<<s.size()<<endl;
for(i=s.size()-1;i>=0;i--) cout<<s[i]<<" ";
}
return 0;




}