#include <bits/stdc++.h>
using namespace std;
#define ll long long

int main(){
	ll n;
	cin>>n;
	ll a,b,c,d;
	cin>>b>>a>>d>>c;
    d=n-1-d;
    b=n-1-b;
	ll g[2];

	if(d>=b){
	if(c>=a){
	if((d-b)>=2*(c-a)){
if((d-b)%2==0){
	if(((d-b)/2+c-a)%2==0){
     g[1]=((d-b)/2-(c-a))/2;
     g[0]=((d-b)/2+(c-a))/2;
if(g[1]>a){
    cout<<g[0]+g[1]<<endl;
	for(ll i=0;i<a;i++){
 cout<<"UL"<<" ";
	}
	for(ll i=a;i<g[1];i++){
 cout<<"UR"<<" "<<"UL"<<" ";
	}
	for(ll i=g[1]-a;i<g[0];i++){
 cout<<"UR"<<" ";
	}
	cout<<endl;
}
else{
	cout<<g[0]+g[1]<<endl;
	for(ll i=0;i<g[1];i++){
 cout<<"UL"<<" ";
	}
	for(ll i=0;i<g[0];i++){
 cout<<"UR"<<" ";
	}
	cout<<endl;
}
	}
	else{
	cout<<"Impossible"<<endl;
	}
}
else{
	cout<<"Impossible"<<endl;
}
	}
	else{
	if((d-b)%2==0){
g[0]=(d-b)/2;
if((c-a-g[0])%2==0){
g[1]=(c-a-(g[0]))/2;
cout<<g[0]+g[1]<<endl;
for(ll i=0;i<g[0];i++){
	cout<<"UR"<<" ";
}
for(ll i=0;i<g[1];i++){
	cout<<"R"<<" ";
}
cout<<endl;
}
else{
	cout<<"Impossible"<<endl;
}
	}
	else{
	cout<<"Impossible"<<endl;
	}
	}
	}
	else{
	if((d-b)>=2*(a-c)){
    if((d-b)%2==0){
	if(((d-b)/2+a-c)%2==0){
     g[1]=((d-b)/2-(a-c))/2;
     g[0]=((d-b)/2+(a-c))/2;
if(g[1]>a){
cout<<g[0]+g[1]<<endl;
	for(ll i=0;i<a;i++){
 cout<<"UL"<<" ";
	}
	for(ll i=a;i<g[0];i++){
 cout<<"UR"<<" "<<"UL"<<" ";
	}
	for(ll i=g[0]-a;i<g[1];i++){
 cout<<"UR"<<" ";
	}
	cout<<endl;
}
else{
	cout<<g[0]+g[1]<<endl;
	for(ll i=0;i<g[0];i++){
 cout<<"UL"<<" ";
	}
	for(ll i=0;i<g[1];i++){
 cout<<"UR"<<" ";
	}
	cout<<endl;
}
	}
	else{
	cout<<"Impossible"<<endl;
	}
}
else{
	cout<<"Impossible"<<endl;
}
	}
	else{
	if((d-b)%2==0){
g[0]=(d-b)/2;
if((a-c-g[0])%2==0){
g[1]=(a-c-(g[0]))/2;
cout<<g[0]+g[1]<<endl;
for(ll i=0;i<g[0];i++){
	cout<<"UL"<<" ";
}
for(ll i=0;i<g[1];i++){
	cout<<"L"<<" ";
}
cout<<endl;
}
else{
	cout<<"Impossible"<<endl;
}
	}
	else{
	cout<<"Impossible"<<endl;
	}
	}
	}

	}
	else{

if(c>=a){
	if((b-d)>=2*(c-a)){
if((b-d)%2==0){
	if(((b-d)/2+c-a)%2==0){
     g[1]=((b-d)/2-(c-a))/2;
     g[0]=((b-d)/2+(c-a))/2;
if(g[0]+a>n-1){
    cout<<g[0]+g[1]<<endl;
	for(ll i=0;i<n-1-a;i++){
 cout<<"LR"<<" ";
	}
	for(ll i=n-1-a;i<g[0];i++){
 cout<<"LL"<<" "<<"LR"<<" ";
	}
	for(ll i=g[0]+a+1-n;i<g[1];i++){
 cout<<"LL"<<" ";
	}
	cout<<endl;
}
else{
	cout<<g[0]+g[1]<<endl;
	for(ll i=0;i<g[0];i++){
 cout<<"LR"<<" ";
	}
	for(ll i=0;i<g[1];i++){
 cout<<"LL"<<" ";
	}
	cout<<endl;
}
	}
	else{
	cout<<"Impossible"<<endl;
	}
}
else{
	cout<<"Impossible"<<endl;
}
	}
	else{
	if((b-d)%2==0){
g[0]=(b-d)/2;
if((c-a-g[0])%2==0){
g[1]=(c-a-(g[0]))/2;
cout<<g[0]+g[1]<<endl;
for(ll i=0;i<g[1];i++){
	cout<<"R"<<" ";
}
for(ll i=0;i<g[0];i++){
	cout<<"LR"<<" ";
}
cout<<endl;
}
else{
	cout<<"Impossible"<<endl;
}
	}
	else{
	cout<<"Impossible"<<endl;
	}
	}
	}
	else{
	if((b-d)>=2*(a-c)){
    if((b-d)%2==0){
	if(((b-d)/2+a-c)%2==0){
     g[1]=((b-d)/2-(a-c))/2;
     g[0]=((b-d)/2+(a-c))/2;
if(g[1]+a>n-1){
cout<<g[0]+g[1]<<endl;
	for(ll i=0;i<n-1-a;i++){
 cout<<"LR"<<" ";
	}
	for(ll i=n-1-a;i<g[1];i++){
 cout<<"LL"<<" "<<"LR"<<" ";
	}
	for(ll i=g[1]+a+1-n;i<g[0];i++){
 cout<<"LL"<<" ";
	}
	cout<<endl;
}
else{
	cout<<g[0]+g[1]<<endl;
	for(ll i=0;i<g[1];i++){
 cout<<"LR"<<" ";
	}
	for(ll i=0;i<g[0];i++){
 cout<<"LL"<<" ";
	}
	cout<<endl;
}
	}
	else{
	cout<<"Impossible"<<endl;
	}
}
else{
	cout<<"Impossible"<<endl;
}
	}
	else{
	if((b-d)%2==0){
g[0]=(b-d)/2;
if((a-c-g[0])%2==0){
g[1]=(a-c-(g[0]))/2;
cout<<g[0]+g[1]<<endl;
for(ll i=0;i<g[0];i++){
	cout<<"LL"<<" ";
}
for(ll i=0;i<g[1];i++){
	cout<<"L"<<" ";
}
cout<<endl;
}
else{
	cout<<"Impossible"<<endl;
}
	}
	else{
	cout<<"Impossible"<<endl;
	}
	}
	}

	}





	}