import java.io.*;
import java.math.BigInteger;
import java.util.*;
 
 
class TestClass{
		
	public static void main(String[] args) throws Exception{
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(System.out));
		int n=Integer.parseInt(br.readLine());
		int count[][]=new int[n][n];
		String parent[][]=new String[n][n];
		for(int i=0;i<n;i++)
			for(int j=0;j<n;j++)
				parent[i][j]="";
		for(int i=0;i<n;i++)
			Arrays.fill(count[i], -1);
		StringTokenizer st=new StringTokenizer(br.readLine());
		int iStart=Integer.parseInt(st.nextToken());
		int jStart=Integer.parseInt(st.nextToken());
		int iEnd=Integer.parseInt(st.nextToken());
		int jEnd=Integer.parseInt(st.nextToken());
		count[iStart][jStart]=0;
		LinkedList<Integer> i=new LinkedList<Integer>();
		LinkedList<Integer> j=new LinkedList<Integer>();
		boolean flag=true;
		i.add(iStart);
		j.add(jStart);
		int vari=0,varj=0;
		while(!i.isEmpty()&&flag)
		{
			vari=i.pollFirst();
			varj=j.pollFirst();
			if(vari==iEnd&&varj==jEnd)
			{
				flag=false;
				break;
			}
			if(vari-2>=0)
			{
				if(varj-1>=0&&count[vari-2][varj-1]==-1)
				{
					count[vari-2][varj-1]=count[vari][varj]+1;
					parent[vari-2][varj-1]=parent[vari][varj]+" UL";
					i.addLast(vari-2);
					j.addLast(varj-1);
				}
				if(varj+1<n&&count[vari-2][varj+1]==-1)
				{
					count[vari-2][varj+1]=count[vari][varj]+1;
					parent[vari-2][varj+1]=parent[vari][varj]+" UR";
					i.addLast(vari-2);
					j.addLast(varj+1);
				}
			}
			if(varj+2<n&&count[vari][varj+2]==-1)
			{
				count[vari][varj+2]=count[vari][varj]+1;
				parent[vari][varj+2]=parent[vari][varj]+" R";
				i.addLast(vari);
				j.addLast(varj+2);
			}
			if(vari+2<n)
			{
				if(varj+1<n&&count[vari+2][varj+1]==-1)
				{
					count[vari+2][varj+1]=count[vari][varj]+1;
					parent[vari+2][varj+1]=parent[vari][varj]+" LR";
					i.addLast(vari+2);
					j.addLast(varj+1);
				}
				if(varj-1>=0&&count[vari+2][varj-1]==-1)
				{
					count[vari+2][varj-1]=count[vari][varj]+1;
					parent[vari+2][varj-1]=parent[vari][varj]+" LL";
					i.addLast(vari+2);
					j.addLast(varj-1);
				}
			}
			if(varj-2>=0&&count[vari][varj-2]==-1)
			{
				count[vari][varj-2]=count[vari][varj]+1;
				parent[vari][varj-2]=parent[vari][varj]+" L";
				i.addLast(vari);
				j.addLast(varj-2);
			}
			
		}
		if(!flag)
		{
			bw.write(Integer.toString(count[iEnd][jEnd]));
			bw.newLine();
			bw.write(parent[iEnd][jEnd].substring(1, parent[iEnd][jEnd].length()));
		}
		else
			bw.write("Impossible");
		bw.flush();
		bw.close();
		br.close();

	}
}