#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    int i1;
    int j1;
    int i2;
    int j2;
    int arr[100000];
    cin >> i1 >> j1 >> i2 >> j2;
    if(((i1-i2)%2!=0)||((i1-i2==0)&&(j1-j2)%2!=0))
        cout<<"Impossible";
    else
    {
        int i=0;
        int difference1=i2-i1;
        int difference2=j2-j1;
        if(difference1>0&&difference2>=0)
        {
            while(difference1!=0)
            {
                arr[i++]=4;
                difference1=difference1-2;
            }
        }
        else if(difference1>0&&difference2<=0)
        {
             while(difference1!=0)
            {
                arr[i++]=5;
                difference1=difference1-2;
            }
        }
        else if(difference1<0&&difference2>=0)
        {
              while(difference1!=0)
            {
                arr[i++]=2;
                difference1=difference1+2;
            }
        }
        else if(difference1<0&&difference2<=0)
        {
            
              while(difference1!=0)
            {
                arr[i++]=1;
                difference1=difference1+2;
            }
        }
        int k=0;
            for(int p=0;p<i;p++)
            {
                if(arr[p]==1)
                    k=k-1;
                else if(arr[p]==2)
                    k=k+1;
                else if(arr[p]==4)
                    k=k+1;
                else if(arr[p]==5)
                    k=k-1;
                    
            }
        if(k>0)
        {
            while(k!=0)
            { arr[i++]=3;
            k=k-2;
            }
        }
        else if(k<0)
        {
            while(k!=0)
            {
                arr[i++]=6;
                k=k+2;
            }
        }
        sort(arr,arr+i);
        cout<<i<<endl;
        for(int c=0;c<i;c++)
        {
            if(arr[c]==1)
                cout<<"UL ";
            else if(arr[c]==2)
                cout<<"UR ";
            else if(arr[c]==3)
                cout<<"R ";
            else if(arr[c]==4)
                cout<<"LR ";
            else if(arr[c]==5)
                cout<<"LL ";
            else if(arr[c]==6)
                cout<<"L ";
        }
        
    }
    
    return 0;
}