#include<bits/stdc++.h>
using namespace std;

int main()
{
    int n,r2,c2,r1,c1,x,i,cnt;
    string str = "";

    cin >> n >> r1 >> c1 >> r2 >> c2;
    if(abs(r2-r1)%2 != 0)
    {
        cout << "Impossible";
        return 0;
    }
    else if(r2 == r1 && c1 == c2)
    {
        cout << "0";
        return 0;
    }
    if(r1 >= r2)
    {
        if(c1 > c2)
        {
            //2nd quadrant
            x = (r1-r2)/2;
            c1 -= x;
            if((c1-c2)%2 != 0)
            {
                cout << "Impossible";
                return 0;
            }
            for(i=0;i<x;i++)
                str = str + "UL ";
            for(i=0;i<(c1-c2)/2;i++)
                str = str + "L ";
            cnt = x + (c1-c2)/2;
        }
        else if(c1 < c2)
        {
            //1st quadrant
            x = (r1-r2)/2;
            c1 += x;
            if((c2-c1)%2 != 0)
            {
                cout << "Impossible";
                return 0;
            }
            for(i=0;i<x;i++)
                str = str + "UR ";
            for(i=0;i<(c2-c1)/2;i++)
                str = str + "R ";
            cnt = x + (c2-c1)/2;
        }
        else
        {
            //Upper Y axis
            x = r1-r2;
            if(x%4 != 0)
            {
                cout << "Impossible";
                return 0;
            }
            for(i=0;i<x/4;i++)
                str = str + "UL UR ";
            cnt = x/2;
        }
    }
    else
    {
        if(c1 < c2)
        {
            //4th quadrant
            x = (r2-r1)/2;
            if((c2-c1-x)%2 != 0)
            {
                cout << "Impossible";
                return 0;
            }
            for(i=0;i<(c2-c1-x)/2;i++)
                str = str + "R ";
            for(i=0;i<x;i++)
                str = str + "LR ";
            cnt = x + (c2-c1-x)/2;
        }
        else if(c1 > c2)
        {
            //3rd quadrant
            x = (r2-r1)/2;
            c1 -= x;
            if((c1-c2)%2 != 0)
            {
                cout << "Impossible";
                return 0;
            }
            for(i=0;i<x;i++)
                str = str + "LL ";
            for(i=0;i<(c1-c2)/2;i++)
                str = str + "L ";
            cnt = x + (c1-c2)/2;
        }
        else
        {
            x = r2-r1;
            if(x%4 != 0)
            {
                cout << "Impossible";
                return 0;
            }
            for(i=0;i<x/4;i++)
                str = str + "LR LL ";
            cnt = x/2;
        }
    }

    cout << cnt << "\n" << str;
    return 0;
}