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

void solution(int i1,int j1,int i2,int j2,int count,vector<string> v){
    if((abs(i2-2*j2-i1+2*j1))%2!=0||(abs(i2+2*j2-i1-2*j1))%2!=0)cout<<"Impossible"<<endl;
    else{
        int d1=i2-i1;
        int d2=j2-j1;
        if(d1==0){
            if(d2>0){count++;v.push_back("R ");solution(i1,j1+2,i2,j2,count,v);}
            else if(d2<0){count++;v.push_back("L ");solution(i1,j1-2,i2,j2,count,v);}
            else{cout<<count<<endl;
                for(size_t i=0;i<v.size();i++){
                    cout<<v[i];
                }}
        }
        else if(d2==0){
            if(d1>0){count+=2;v.push_back("LR LL ");solution(i1+4,j1,i2,j2,count,v);}
            if(d1<0){count+=2;v.push_back("UL UR ");solution(i1-4,j1,i2,j2,count,v);}
        }
        else if(d1>0&&d2>0){
            count++;
            v.push_back("LR ");
            solution(i1+2,j1+1,i2,j2,count,v);
        }
        else if(d1<0&&d2<0){
            count++;
            v.push_back("UL ");
            solution(i1-2,j1-1,i2,j2,count,v);
        }   
        else if(d1>0&&d2<0){
            count++;
            v.push_back("LL ");
            solution(i1+2,j1-1,i2,j2,count,v);
        }
        else if(d1<0&&d2>0){
            count++;
            v.push_back("UR ");
            solution(i1-2,j1+1,i2,j2,count,v);
        }
    }
}
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    int i1,j1,i2,j2;
    cin>>n>>i1>>j1>>i2>>j2;
    vector<string> v;
    solution(i1,j1,i2,j2,0,v);
    return 0;
}