#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    int a,b,x,y;
    cin>>a>>b>>x>>y;
    int dx = x - a;
    int dy = y - b;
    int u,v;
    if( dx >= 0){
        u = 1;
    }
    else{
        u = -1;
    }
    if(dy >= 0) v = 1;
    else v = -1;
    int flag =0;
    int fi , fj ;
    //cout<<u<<" "<<v<<endl;
    //cout<<dx<<" "<<dy<<endl;
    for(int i=0;i<=abs(dx);i++){
        for(int j=0;j<=abs(dy);j++){
            int tx = a+(2*i*u) + (1*j*v);
            int ty = b+(2*j*v);
            //cout<<"("<<i<<","<<j<<")"<<tx<<" "<<ty<<endl;
            if(tx == y && ty == x){
                flag = 1;
                fi = i;
                fj = j;
            }
        }
    }
    if(flag == 0){
        cout<<"Impossible\n";
    }
    else{
        cout<<fi+fj<<"\n";
        string st;
        st = ( u>0 && v>0)? "LR" : ( u>0 && v<0)?  "LL" : ( u<0 && v>0)? "UR" :"UL";
        for(int i=0;i<fj;i++){
            cout<< st <<" ";
        }
        st = ( u > 0)? "R" : "L";
        for(int i=0;i<fi;i++){
            cout<< st <<" ";
        }
        cout<<"\n";
    }
    return 0;
}