#include <bits/stdc++.h>
using namespace std;
int main() 
{
    int n;
    cin>>n;
    int hx,hy,ex,ey;
    cin>>hy>>hx>>ey>>ex;
    vector<string> v;
    int flag=1;
    while(1)
    {
        if(hy==ey && hx==ex)
            break;
        else if(hy==ey && hx>ex)
        {
            v.push_back("L");
            hx--;
        }
        else if(hy==ey && hx<ex)
        {
            v.push_back("R");
            hx++;
        }
        else if(abs(hy-ey)==1)
        {//Impossible we cannot reach
            flag=0;
            break;
        }
        else if(hy>ey && hx>ex)
        {
            //Go Upper Left
            v.push_back("UL");
            hx--;
            hy-=2;
        }
        else if(hy>ey && hx<ex)
        {
            //Go Upper Right
            v.push_back("UR");
            hx++;
            hy-=2;
        }
        else if(hy<ey && hx>ex)
        {
            //Go Lower Left
            v.push_back("LL");
            hx--;
            hy+=2;
        }
        else 
        {
            //Go Upper Right
            v.push_back("LR");
            hx++;
            hy+=2;
        }
    }
    if(flag==1)
    {
        cout<<v.size()<<endl;
        for(int i=0;i<v.size();i++)
            cout<<v[i]<<" ";
    }
    else
        cout<<"Impossible";
    return 0;
}