#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,x1,y1,x2,y2;
    cin>>n>>x1>>y1>>x2>>y2;
    std::vector<string> v;
    while(x2!=x1 || y2!=y1)
    {
        if(x2>x1)
        {
            if(x2-x1==1)
                {
                    cout<<"Impossible";
                    return 0;
                }
            if(y2>y1)
            {
                v.push_back("LR");
                x1 += 2;
                y1 ++;
            }
            else if(y2<y1){
                v.push_back("LL");
                x1 += 2;
                y1 --;
            }
            else{
                if(y1<n-1){
                    v.push_back("LR");
                    x1 += 2;
                    y1 ++;
                }
                else{
                    v.push_back("LL");
                    x1 += 2;
                    y1 --;
                }
            }
        }
        else if(x1>x2)
        {
            if(x1-x2==1)
                {
                    cout<<"Impossible";
                    return 0;
                }
            if(y2>y1)
            {
                v.push_back("UR");
                x1 -= 2;
                y1 ++;
            }
            else if(y2<y1){
                v.push_back("UL");
                x1 -= 2;
                y1 --;
            }
            else{
                if(y1<n-1){
                    v.push_back("UR");
                    x1 -= 2;
                    y1 ++;
                }
                else{
                    v.push_back("UL");
                    x1 -= 2;
                    y1 --;
                }
            }
        }
        else if(x1==x2)
        {
            if(abs(y2-y1)==1)
            {
                cout<<"Impossible";
                return 0;
            }
            if(y2>y1)
            {
                v.push_back("R");
                y1 +=2;
            }
            else if(y2<y1){
                v.push_back("L");
                y1 -= 2;
            }
        }
    }
    cout<<v.size()<<endl;
    for(int i=0;i<v.size();++i)
        cout<<v[i]<<" ";
    return 0;
}