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


int main() {
    int n;
    cin>>n;
    int x1,y1,x2,y2,count=0,freq[6]={0};
    cin>>x1>>y1>>x2>>y2;
    bool valid=false;
    if(((int)fabs(y1-y2))%2==0)
    {
        if(((int)fabs(x1-x2))%2!=0)
            valid=true;
    }
    if(!valid)
        cout<<"Impossible";
    else
    {
        while(!(x1==x2&&y1==y2))
        {
            if(y2>y1&&x2>x1)
            {
                y2-=2;
                x2-=1;
                freq[0]++;
                count++;
            }
            else if(y2>y1&&x1>x2)
            {
                y2-=2;
                x2+=1;
                freq[1]++;
                count++;
            }
            else if(y2==y1&&x2<x1)
            {
                x2+=1;
                freq[2]++;
                count++;
            }
            else if(y2<y1&&x2<x1)
            {
                y2-=2;
                x2+=1;
                freq[3]++;
                count++;
            }
            else if(y2<y1&&x2>x1)
            {
                y2-=2;
                x2-=1;
                freq[4]++;
                count++;
            }
            else if(y2==y1&&x2>x1)
            {
                x2-=1;
                freq[5]++;
                count++;
            }
        }
        string s[6]={"UL","UR","R","LR","LL","L"};
        cout<<count<<endl;
        for(int i=0;i<6;i++)
        {
            for(int j=0;j<freq[i];j++)
            {
                cout<<s[i]<<" ";
            }
        }
    }
    
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}