#include <bits/stdc++.h>
using namespace std;
int mini = INT_MAX;
vector<string>ans;
int a,b,c,d;
int n;
int main(int argc, char const *argv[])
{
	vector<string>v;
	cin>>n;
	cin>>a>>b>>c>>d;
	int ans=(a-c);
	int ans2 = (b-d);
	int l=0,r=0,u=0,d=0;
	if(ans>0){
		u = ans;
	}
	else{
		d = (-1)*ans;
	}
	if(ans2>0){
		l = ans2;
	}
	else{
		r = (-1)*ans2;
	}
	//cout<<l<<" "<<r<<" "<<u<<" "<<d<<endl; 
	while(1){
		u-=2;
		l--;
		if(u<0 || l<0)
		{
			u+=2;
			l++;
			break;
		}
		v.push_back("UL");
	}
	while(1){
		u-=2;
		r--;
		if(u<0 || r<0)
		{
			u+=2;
			r++;
			break;
		}
		v.push_back("UR");
	}
	while(1){
		d-=2;
		l--;
		if(d<0 || l<0)
		{
			d+=2;
			l++;
			break;
		}
		v.push_back("LL");
	}
	while(1){
		d-=2;
		r--;
		if(d<0 || r<0)
		{
			d+=2;
			r++;
			break;
		}
		v.push_back("LR");
	}
	int cnt=0;
	while(u>1){
		if(cnt&1)
		{
			v.push_back("UL");
			l--;
			r++;
		}
		else{
			v.push_back("UR");
			l++;
			r--;
		}
        u-=2;
		cnt++;
	}
	while(d>1){
		if(cnt&1)
		{
			v.push_back("LL");
			l--;
			r++;
		}
		else{
			v.push_back("LR");
			l++;
			r--;
		}
        d-=2;
		cnt++;
	}
	while(l>1){
		l-=2;
		v.push_back("L");
	}
	while(r>1){
		r-=2;
		v.push_back("R");
	}
	if(u || d || l || r){
		cout<<"Impossible"<<endl;
		return 0;
	}
	cout<<v.size()<<endl;
	for(int i=0;i<v.size();i++){
		cout<<v[i]<<" ";
	}
	cout<<endl;
	return 0;
}