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


int main() {
    int n,a,b,c,d;
    cin>>n;
    cin>>a>>b>>c>>d;
    int x=a,y=b,ans=0,flag=0;
    string s="";
    int ola = abs(x-c);
    if((ola%2) ==1) {
        cout<<"Impossible";
        return 0;
    }
    while(x!=c || y!=d) {
//        cout<<x<<y<<endl;
        ans++;
        int len=s.length();
            if(y>=d && x>=(c+2)) {
                x-=2;
                y--;
                if(s[len-3]=='L' && s[len-2]=='R'){
                    flag=1;
                    break;
                }
                s+="UL ";
            }
        
            else if((y<=d) && x>=(c+2)) {
                x-=2;
                y++;
                if(s[len-3]=='L' && s[len-2]=='L'){
                    flag=1;
                    break;
                }
                s+="UR ";
            }
        
            else if((y<=d) && x==c) {
                y+=2;
                if(s[len-2]=='L'){
                    flag=1;
                    break;
                }
                s+="R ";
            }
        
            else if ((y<=d) && x<=(c-2)) {
                x+=2;
                y++;
                if(s[len-3]=='U' && s[len-2]=='L'){
                    flag=1;
                    break;
                }
                s+="LR ";
            }
        
            else if (y>=d && x<=(c-2)) {
                x+=2;
                y--;
                if(s[len-3]=='U' && s[len-2]=='R'){
                    flag=1;
                    break;
                }
                s+="LL ";
            }
        
            else if(y>=d && x==c) {
                y-=2;
                if(s[len-2]=='R'){
                    flag=1;
                    break;
                }
                s+="L ";
            }
        if(x==c && y==d) {
            break;
        }
        if(x<0 || y<0 || x>=n || y>=n) {
            flag=1;
            break;
        }
    }
    if(flag==1) {
        cout<<"Impossible"<<endl;
    }
    else {
        cout<<ans<<endl;
        cout<<s<<endl;
    }
    return 0;
}