#include <bits/stdc++.h>
using namespace std;
int main() {
    int n,ul=0,ur=0,r=0,lr=0,ll=0,l=0,i,flag=0;
    cin >> n;
    int i_start,j_start,i_end,j_end;
    cin >> i_start >> j_start >> i_end >> j_end;
    
    if((j_start-j_end)%2!=0){
        flag=-1;
    }
    else if(j_start-j_end>0)
    {
        if(i_start-i_end>0)
            ul=(j_start-j_end)/2;
        else if(i_start-i_end<0)
                ur=(j_start-j_end)/2;
    }
    
    else if(j_start-j_end<0)
    {
        if(i_start-i_end>0)
            ll=-(j_start-j_end)/2;
        else if(i_start-i_end<0)
             lr=-(j_start-j_end)/2;
    }
    else if (j_start==j_end)
    {
        if(i_start-i_end>0 && (i_start-i_end)%2==0)
            l+=(i_start-i_end)/2;
        else if(i_start-i_end<0 && (i_start-i_end)%2==0)
            r+=-(i_start-i_end)/2 ;
        else
            flag=-1;
            
    }
      if(i_start-i_end-ll-ul+ur+lr>0 && (i_start-i_end-ll-ul+ur+lr)%2==0)
            l+=(i_start-i_end-ll-ul+ur+lr)/2;
        else if(i_start-i_end<0 && (i_start-i_end)%2==0)
            r=-(i_start-i_end-ll-ul+ur+lr)/2 ;
    
    
    
    
    
    if(flag==-1)
        cout<<"Impossible";
    else
    {
        cout<<ul+ur+r+l+ll+lr<<endl;
        for(i=0;i<ul;i++)
            cout<<"UL"<<" ";
        
        for(i=0;i<ur;i++)
            cout<<"UR"<<" ";
        
        for(i=0;i<r;i++)
            cout<<"R"<<" ";
        
        for(i=0;i<l;i++)
            cout<<"LR"<<" ";
        
        for(i=0;i<ll;i++)
            cout<<"LL"<<" ";
        
        for(i=0;i<l;i++)
            cout<<"L"<<" ";
    }
    return 0;
}