#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include<bits/stdc++.h>

using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n;cin>>n;
    int arr[200][200]={0};
    int istart,jstart,iend,jend;
    cin>>istart>>jstart>>iend>>jend;
    int temp1=istart;int temp2=jstart;int moves=0;int i=0;char string[100];
     while((temp1<iend)&&(temp2==jend)&&(temp1<n)&&(temp2>=0)&&(temp2<n)&&(temp1>=0))
    {
        temp1+=2;temp2+=1;moves++;string[i]='L';i++;string[i]='R';i++;string[i]=' ';i++;
    }
    while((temp1>iend)&&(temp2==jend)&&(temp1<n)&&(temp2>=0)&&(temp2<n)&&(temp1>=0))
    {
                temp1-=2;temp2+=1;moves++;string[i]='U';i++;string[i]='R';i++;string[i]=' ';i++;

    }
    while((temp1<iend)&&(temp2<jend)&&(temp1<n)&&(temp2<n))
    {
        temp1+=2;temp2+=1;moves++;string[i]='L';i++;string[i]='R';i++;string[i]=' ';i++;
        if((temp1==iend)&&(temp2==jend))
        {
            break;
        }
    }
    while((temp1<iend)&&(temp2>jend)&&(temp1<n)&&(temp2>=0))
    {
        temp1+=2;temp2-=1;moves++;string[i]='L';i++;string[i]='L';i++;string[i]=' ';i++;
        if((temp1==iend)&&(temp2==jend))
        {
            break;
        }
    }
    while((temp1>iend)&&(temp2<jend)&&(temp1>=0)&&(temp2<n))
    {
        temp1-=2;temp2+=1;moves++;string[i]='U';i++;string[i]='R';i++;string[i]=' ';i++;
        if((temp1==iend)&&(temp2==jend))
        {
            break;
        }
    }
    while((temp1>iend)&&(temp2>jend)&&(temp1>=0)&&(temp2>=0))
    {
        temp1-=2;temp2-=1;moves++;string[i]='U';i++;string[i]='L';i++;string[i]=' ';i++;
        if((temp1==iend)&&(temp2==jend))
        {
            break;
        }
    }
    while((temp1==iend)&&(temp2<jend)&&(temp1<n)&&(temp2<n))
    {
        temp2+=2;moves++;string[i]='R';i++;string[i]=' ';i++;
        if((temp1==iend)&&(temp2==jend))
        {
            break;
        }
    }
    while((temp1==iend)&&(temp2>jend)&&(temp1<n)&&(temp2>=0))
    {
        temp2-=2;moves++;string[i]='L';i++;string[i]=' ';i++;
        if((temp1==iend)&&(temp2==jend))
        {
            break;
        }
    }
   
    if((temp1!=iend)||(temp2!=jend))
        {
            
           cout<<"Impossible"<<endl;moves=-1;
        }
        
    if(moves!=-1)
    {
        cout<<moves<<endl;cout<<string;
    }    
    return 0;
}