#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    int n,a,b,x,y,m=0;
    string s[1000];
    cin>>n>>a>>b>>x>>y;
    if(abs(x-a)%2==1)
        cout<<"Impossible"<<endl;
    else
    {
    while(a>x && b>=y)
    {
    s[m]="UL";
    m++;
    a-=2;
    b-=1;
    }
    while(a>x && b<y)
    {
    s[m]="UR";
    m++;
    a-=2;
    b+=1;
    }
    while(x==a && b<y)
    {
    s[m]="R";
    m++;
    b+=2;
    }
     while(a<x && b<=y)
    {
    s[m]="LR";
    m++;
    a+=2;
    b+=1;
    }
     while(a<x && b>y)
    {
    s[m]="LL";
    m++;
    a+=2;
    b-=1;
    }
     while(x==a && b>y)
    {
    s[m]="L";
    m++;
    b-=2;
    }
    if(y==b && x==a)
    {
        cout<<m<<endl;
        for(int i=0;i<m;i++)
            cout<<s[i]<<" ";
        cout<<endl;
    }
    else
    {
    cout<<"Impossible";
    }
    }
    return 0;
}