#include<bits/stdc++.h>
#include<vector>
using namespace std;
int main()
{
	int n;
	cin>>n;
	vector<int> path;
	int a,b,c,d;
	cin>>a>>b>>c>>d;
	if(abs(c-a)%2 == 1)
	{
		cout<<"Impossible"<<endl;
	}
	else
	{
		int height = abs(c-a);
		int height_step = height/2;
		int width = abs(d-b);
		if((width%2 == 0 && height_step%2 == 1) || (width%2 == 1 && height_step%2 == 0))
		{
			cout<<"Impossible"<<endl;
		}
		else
		{
			int count = 0;
			if(height_step >= width)
			{
				count = height_step;
			}
			else
			{
				width -= height_step;
				count = height_step;
				count += width/2;
				if(a > c && b > d)
				{
					for(int i=0;i<height_step;i++)
					{
						path.push_back(3);
					}
					for(int i=0;i<width/2;i++)
					{
						path.push_back(1);
					}
				}
				else if(a < c && b < d)
				{
					for(int i=0;i<width/2;i++)
					{
						path.push_back(2);
					}
					for(int i=0;i<height_step;i++)
					{
						path.push_back(6);
					}
				}
				else if(a < c && b > d)
				{
					for(int i=0;i<width/2;i++)
					{
						path.push_back(1);
					}
					for(int i=0;i<height_step;i++)
					{
						path.push_back(5);
					}
				}
				else if(a > c && b < d)
				{
					for(int i=0;i<width/2;i++)
					{
						path.push_back(2);
					}
					for(int i=0;i<height_step;i++)
					{
						path.push_back(4);
					}
				}
			}
			cout<<count<<endl;
			for(int i=0;i<path.size();i++)
			{
				if(path[i] == 1)
				{
					cout<<"L ";
				}
				else if(path[i] == 2)
				{
					cout<<"R ";
				}
				else if(path[i] == 3)
				{
					cout<<"UL ";
				}
				else if(path[i] == 4)
				{
					cout<<"UR ";
				}
				else if(path[i] == 5)
				{
					cout<<"LL ";
				}
				else
				{
					cout<<"LR ";
				}		
			}
			cout<<endl;
		}
		
		
	}
}