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


int main() {
    int n;
    cin>>n;
    vector<string> v;
    int startj,starti,endj,endi;
    cin>>startj>>starti>>endj>>endi;
    while(true){
       //cout<<"********************"<<endl;
        if(abs(starti-endi)<=1&&abs(startj-endj)<=1)
            break;
        //cout<<"********************"<<endl;
        if(startj==endj){
            if(starti>endi){
                v.push_back("L");
                starti-=2;
            }
            else{
                v.push_back("R");
                starti+=2;
            }
        }
        else if(startj>endj){
            if(starti>=endi&&starti>=1){
                v.push_back("UL");
                starti-=1;
                startj-=2;
            }
            else if(starti<=endi&&starti<=n-2){
                v.push_back("UR");
                starti+=1;
                startj-=2;
            }
        }
        else if(startj<endj){
            if(starti<=endi&&starti<=n-2){
                v.push_back("LR");
                starti+=1;
                startj+=2;
            }
            else if(starti>=endi&&starti>=1){     
                v.push_back("LL");
                starti-=1;
                startj+=2;
            }
        }
      // cout<<"after this loop= "<<starti<<" "<<startj<<endl;
    }
    if(starti==endi&&startj==endj){
        cout<<v.size()<<endl;
        for(int i=0;i<v.size();i++)
            cout<<v[i]<<" ";
    }
    else
        cout<<"Impossible";
}