#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() 
{
    string a[6]={"L","R","UL","UR","LL","LR"};
    int n;
    int x1,x2,y1,y2;
    cin>>n>>x1>>y1>>x2>>y2;
    vector<int> ans;
    int t=abs(x1-x2);
    if(t%2==0)
    {
        int steps=0;
        int fans=0;
        if(abs((y1-(((y1-y2)/abs(y1-y2))*(t/2))) - y2)%2 != 0)
        {
            cout<<"Impossible\n";
        }
        else
        {
            steps+=t/2;
            fans+=steps;
            fans+=(abs((y1-(((y1-y2)/abs(y1-y2))*(t/2))) - y2)/2);
            cout<<fans<<endl;
            if((x1-x2)>0 && (y1-y2)<0)
            {
                for(int i=0;i<steps;i++)
                {
                    cout<<"UR ";
                }
                steps=fans-steps;
                for(int i=0;i<steps;i++)
                {
                    cout<<"R ";
                }
            }
            else if((x1-x2)>0 && (y1-y2)>0)
            {
                for(int i=0;i<steps;i++)
                {
                    cout<<"UL ";
                }
                steps=fans-steps;
                for(int i=0;i<steps;i++)
                {
                    cout<<"L ";
                }
            }
            else if((x1-x2)<0 && (y1-y2)<0)
            {
                for(int i=0;i<steps;i++)
                {
                    cout<<"LL ";
                }
                steps=fans-steps;
                for(int i=0;i<steps;i++)
                {
                    cout<<"L ";
                }
            }
            else if((x1-x2)<0 && (y1-y2)>0)
            {
                for(int i=0;i<steps;i++)
                {
                    cout<<"LR ";
                }
                steps=fans-steps;
                for(int i=0;i<steps;i++)
                {
                    cout<<"R ";
                }
            }
            else
            {
                
            } 
        }
    }
    else
        cout<<"Impossible\n";
    return 0;
}