#include <bits/stdc++.h>

using namespace std;

#define MOD 1000000007
#define PB push_back
#define INS insert
#define MP make_pair
#define LL long long int
#define SS string
#define VG vector< vector<int> > 
#define VI vector<int>
#define VL vector<LL>

int n,x1,x2,z1,z2,ans=0,t1,t2,ul,ur,ll,lr,r,l;
vector<string> ss;
#define TRACE
#ifdef TRACE
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
	template <typename Arg1>
	void __f(const char* name, Arg1&& arg1){
		cerr << name << " : " << arg1 << std::endl;
	}
	template <typename Arg1, typename... Args>
	void __f(const char* names, Arg1&& arg1, Args&&... args){
		const char* comma = strchr(names + 1, ','); cerr.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...);
	}
#else
#define trace(...)
#endif

LL XpowerY(LL x, LL y, LL m){
	LL ans=1;
	x=x%m;
	while(y>0){
		if(y%2==1)
			ans=(ans*x)%m;
		x=((x%m)*(x%m))%m;
		y=y>>1;
	}
	return ans%m;
}

int func(){
	for(int i=0;i<abs(z1-x1)/2;i++){
		t2>t1?ss.PB("UR"):ss.PB("UL");
		if(t2>t1) {t1++;ur++;}
		else {t1--;ul++;}
	}
	if(abs(t1-t2)%2) {cout<<"Impossible\n";ss.clear();return 0;}
	else{
		for(int i=0;i<abs(t1-t2)/2;i++){
			(t2>t1)?ss.PB("R"):ss.PB("L");
			if(t2>t1) r++;
			else l++;
		}
	}
	return 0;
}

int main(){int fl=0;
	cin >> n >> x1 >> x2 >> z1 >> z2;t1=x2,t2=z2;
	if(abs(z1-x1)%2) {cout << "Impossible\n";return 0;}
	else{
		if(x1<z1){
			int temp=x1;x1=z1;z1=temp;
			temp=x2;x2=z2;z2=temp;fl=1;
		}func();
		if(ss.size() != 0){
			cout << ss.size() << endl;
			if(fl){
				int temp=r,r=l,l=temp;ll=ul,lr=ur;ul=0, ur=0;
			}
			for(int i=0;i<ul;i++) cout << "UL ";
			for(int i=0;i<ur;i++) cout << "UR ";
			for(int i=0;i<r;i++) cout << "R ";
			for(int i=0;i<lr;i++) cout << "LR ";
			for(int i=0;i<ll;i++) cout << "LL ";
			for(int i=0;i<l;i++) cout << "L "; 
			cout << endl;
		}
	}
	return 0;
}