#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	int a,b,c,d;
	long long int ans=0;
	cin>>a>>b>>c>>d;
	if(abs(a-c)%2==1)cout<<"Impossible"<<endl;
	
	else {
		int count=0,flag=0;
		vector<string> v;
		while(1){
			if(a==c)break;
			if(d==b)break;
			if(a<c){
				a+=2;
				count++;
				if(d>b){
					v.push_back("LR");
					b+=1;
				}
				else {
					v.push_back("LL");
					b-=1;
				}
			}
			else{
				count++;
				a-=2;
				if(d>b){
					v.push_back("UR");
					b+=1;
				}
				else {
					v.push_back("UL");
					b-=1;
				}
			}
		}
		if(d!=b){
			if(abs(d-b)%2==1)flag=1;
			else {
				while(1){
					if(d==b)break;
					count++;
					if(d>b){
						v.push_back("R");
						b+=2;
					}
					else{
						v.push_back("L");
						b-=2;
					}
				}
			}
		}
		else if(a!=c){
			if(abs(a-c)%4!=0)flag=1;
			else{
				while(1){
					if(a==c)break;
					count+=2;
					if(c>a){
						v.push_back("LR");
						v.push_back("LL");
						a+=4;
					}
					else{
						v.push_back("UL");
						v.push_back("UR");
						a-=4;
					}
				}
			}
		}
		if(flag==1)cout<<"Impossible"<<endl;
		else{
			cout<<count<<endl;
			sort(v.begin(),v.end());
			reverse(v.begin(),v.end());
			for(int i=0;i<int(v.size());i++){
				cout<<v[i]<<" ";
			}
			cout<<endl;
		}
	}
		return 0;
}




				

		/*int flag=0;
		ans+=abs(a-c)/2;
		if(d>=b){
			if(b+ans<d){
				if((d-b-ans)%2==1)flag=1;
				else ans+=(d-b-ans)/2;
			}
			else{
				if((b+ans-d)%2==1)flag=1;
				else ans+=(b+ans-d)/2;
			}

		}
		else {
			if(d+ans<b){
				if((b-d-ans)%2==1)flag=1;
				else ans+=(b-d-ans)/2;
			}
			else{
				if((d+ans-b)%2==1)flag=1;
				else ans+=(d+ans-b)/2;
			}
			
		}
		if(flag)cout<<"Impossible"<<endl;
		else {
			int grag=0;
			cout<<ans<<endl;
			if(c>=a){
				while(1){
				if(b==d and c!=a){grag=1;break;}
				if(a==c)break;
				a+=2;
				if(d>=b)b+=1;
				else b-=1;
				}
				if(grag){
					int u=abs(d-b)/4;
					while(u--){
					cout<<"LR"<<" "<<"LL"<<" ";
					}
				}
			}
		}



		//while(ans--){
			
		//if(d>=b)b+=ans;
	//	else if(d<=b)b-=ans;
	//	if(abs(d-b)%2==1)cout<<"Impossible"<<endl;
	//	else ans+=abs(d-b)/2;
	//	cout<<ans<<endl;
	*/