#include <bits/stdc++.h>
#define ll long long
#define fr first
#define sc second
#define NN ((ll)(4e5+100))
#define ARRS ((ll)(1e6+100))
#define EP ((1.0e-3))
#define M ((ll)(1e9+7))
#define MOD ((ll)(1e9))
#define MAX ((ll)(1e12+7))
#define pb push_back
#define inf ((ll)1e16)
#define mx 2003
#define PI 3.14159265358979323846
using namespace std;

int main(){
    ll n,x,y,a,b;
	cin>>n;
	cin>>x>>y>>a>>b;
	if((x+a)&1){
		cout<<"Impossible";
		return 0;
	}
	vector<string> pas;
	while(x>a){
		if(y<b)
			pas.pb("UR"),x-=2,y+=1;
		else if(y>b)
			pas.pb("UL"),x-=2,y-=1;
		else if(y)
			pas.pb("UL"),x-=2,y-=1;
		else 
			pas.pb("UR"),x-=2,y+=1;
        
	}
	
	while(x<a){
		if(y<b)
			pas.pb("LR"),x+=2,y+=1;
		else if(y>b)
			pas.pb("LL"),x+=2,y-=1;
		else if(y)
			pas.pb("LL"),x+=2,y-=1;
		else 
			pas.pb("LR"),x+=2,y+=1;
	}
	if((y+b)&1){
		cout<<"Impossible";
		return 0;
	}
	while(y<b)
		pas.pb("R"),y+=2;
	
	while(y>b)
		pas.pb("L"),y-=2;
	sort(pas.begin(),pas.end());
    reverse(pas.begin(),pas.end());
	cout<<pas.size()<<endl;
	for(int i=0; i<pas.size(); i++){
		cout<<pas[i]<<" ";
	}


}