#include<bits/stdc++.h>

using namespace std;

int main()
{
	int n,istart,jstart,iend,jend,k,itrans,jtrans;
	cin>>n>>istart>>jstart>>iend>>jend;
	
	itrans=istart;
	jtrans=jstart;
	
	int x=abs(iend-istart);
	int no_of_moves=0,f=0;
	vector<string>vec;
	
	while((itrans!=iend) || (jtrans!=jend))
	{
		if(x%2!=0)
		{
			cout<<"Impossible";
			f=1;
			break;
			
		}
		else if( (jend-jstart)==0 && ((x%4)!=0))
		{
			cout<<"Impossible";
			f=1;
			break;
		}
		else if( ((jend-jstart)%2)!=0 && ((x%4)==0))
		{
			cout<<"Impossible";
			f=1;
			break;
		}
		
		
		if(iend<itrans && jend<jtrans)
		{
			no_of_moves++;
			vec.push_back("UL");
			itrans=itrans-2;
			jtrans=jtrans-1;
		}
		else if(iend<itrans && jend==jtrans)
		{
			no_of_moves++;
			vec.push_back("UL");
			itrans=itrans-2;
			jtrans=jtrans-1;
		}
		else if(iend<itrans && jend>jtrans)
		{
			no_of_moves++;
			vec.push_back("UR");
			itrans=itrans-2;
			jtrans=jtrans+1;
		}
		else if(iend==itrans && jend>jtrans)
		{
			no_of_moves++;
			vec.push_back("R");
			//itrans=itrans-2;
			jtrans=jtrans+2;
		}
		else if(iend>itrans && jend>jtrans)
		{
			no_of_moves++;
			vec.push_back("LR");
			itrans=itrans+2;
			jtrans=jtrans+1;
		}
		else if(iend>itrans && jend==jtrans)
		{
			no_of_moves++;
			vec.push_back("LR");
			itrans=itrans+2;
			jtrans=jtrans+1;
		}
		else if(iend>itrans && jend<jtrans)
		{
			no_of_moves++;
			vec.push_back("LL");
			itrans=itrans+2;
			jtrans=jtrans-1;
		}
		else if(iend==itrans && jend<jtrans)
		{
			no_of_moves++;
			vec.push_back("L");
			//itrans=itrans-2;
			jtrans=jtrans-2;
		}
	}
	if(f==0)
	{
		cout<<no_of_moves<<endl;
		for(k=0;k<vec.size();k++)
		{
			cout<<vec[k]<<" ";
		}
	}
	return 0;
}