#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() 
{
    int n,ii,ji,ie,je,t1,t2,i=0,f=0;
    string c[10];
    cin>>n;
    cin>>ji>>ii>>je>>ie;
    t1=ie-ii;
    t2=je-ji;
    if(abs(ji-je)%2!=0)
    {
        cout<<"Impossible";
        return 0;
    }
    else if(((abs(ii-ie)-(abs(ji-je)%2))%2!=0))
            {
                cout<<"Impossible";
                return 0;
            }
    else if(ii==ie && (abs(ji-je)%2)%2!=0)
            {
                cout<<"Impossible";
                return 0;
            }
    while(t2!=0)
            {
                if(t2<0)
                {
                    if(t1<0)
                    {
                        c[i]="UL ";  
                        i++;
                        t2+=2;
                        t1+=1;
                    }
                    else if(t1>0)
                    {
                        c[i]="UR ";
                        i++;
                        t2+=2;
                        t1-=1;
                    }
                    else if(t1==0)
                    {
                        c[i]="UL ";
                        i++;
                        c[i]="UR ";
                        i++;
                        t2+=4;
                    }   
                }
                else if(t2>0)
                {
                    if(t1<0)
                    {
                        c[i]="LL ";
                        i++;
                        t2-=2;
                        t1+=1;
                    }
                    else if(t1>0)
                    {
                        c[i]="LR ";
                        i++;
                        t2-=2;
                        t1-=1;
                    }
                    else if(t1==0)
                    {
                        c[i]="LR ";
                        i++;
                        c[i]="LL ";
                        i++;
                        t2-=4;
                    }
                }
            }
    while(t1!=0)
            {
             if(t1>0)
             {
                 c[i]="R ";
                 i++;
                 t1-=2;
             }
             else if(t1<0)
             {
                 c[i]="L ";
                 i++;
                 t1+=2;
             }
            }
    cout<<i<<endl;
    for(int z=0;z<i;z++)
        cout<<c[z];
    return 0;
}