//Code of C#oder Born_confused
#include <bits/stdc++.h>
using namespace std;

#define FOR(i,a,b) for(int i=a;i<b;++i)
#define FORD(i,a,b) for(int i=a;i>=b;--i)
#define pb push_back
#define mp make_pair
#define ll long long int
#define s(x) scanf("%d", &x)
#define sd(x) scanf("%lf", &x)
#define sl(x) scanf("%lld", &x)
#define mod 1000000007
#define fi first
#define se second
#define p(x) printf("%d",x)
#define pl(x) printf("%lld", x)
#define pd(x) printf("%lf", x)
#define pn() printf("\n")

int main()
{
	int n; 
	cin>>n;
	int x1,x2,y1,y2;
	cin>>x1>>y1>>x2>>y2;
	if(abs(x1-x2)&1)
	{
		cout<<"Impossible"<<endl;
		return 0;
	}
		if(abs(x1-x2)%4==0&&abs(y1-y2)&1)
		{
			cout<<"Impossible"<<endl;
			 return 0;
		}
		if(abs(x1-x2)%4!=0&&abs(y1-y2)%2==0)
		{
			cout<<"Impossible"<<endl;
			 return 0;
		}
		vector<string>v;
		while(x1!=x2||y1!=y2)
		{
            // cout<<x2<<" "<<y2<<endl;
			if(x1>x2)
			{
				if(y1==y2)
				{
					if(y1==0)
					{
						v.pb("UR");
						x1-=2;
						y1+=1;
					}
					else
					{
					v.pb("UL");
					x1-=2;y1-=1;		
					}
				}
				else if(y1<y2)
				{
					if(abs(y1-y2)*2+4<=abs(x1-x2)&&y1!=0)
					{
						v.pb("UL");
						x1-=2;y1-=1;
					}
					else{
					v.pb("UR");
					x1-=2;y1+=1;
					}
				}
				else if(y1>y2)
				{
					v.pb("UL");
					x1-=2;y1-=1;
				}
				
			}
			else if(y1<y2&&abs(x1-x2)/2<abs(y1-y2))
			{
				v.pb("R");
				y1+=2;
				
			}
			else if(x1<x2)
			{
				if(y1==y2)
				{
					if(y1==n-1)
					{
						v.pb("LL");
						x1+=2;
						y1-=1;
					}
					else
					{
					v.pb("LR");
					x1+=2;y1+=1;		
					}
				}
				else if(y1<y2)
				{
					v.pb("LR");
					x1+=2;y1+=1;
				}
				else if(y1>y2)
				{
					if(abs(y1-y2)*2+4<=abs(x1-x2)&&y1!=n-1)
					{
						v.pb("LR");
						x1+=2;y1+=1;
					}	
					else{
						v.pb("LL");
						x1+=2;y1-=1;
					}
				}	
				
			}
			else if(y1>y2)
			{
				v.pb("L");
				y1-=2;
			}
            // cout<<x1<<" "<<y1<<endl;

		}
		cout<<v.size()<<endl;
		for(int i=0;i<v.size();i++)
		{
			cout<<v[i]<<" ";
		}
	return 0;
}