#include <bits/stdc++.h>

using namespace std;
int main()
{
    int n;
    cin>>n;
    int i1,j1,i2,j2;
    cin>>i1>>j1>>i2>>j2;
    int l=-1,r=-1,u=-1,d=-1,k=0;
    map <int,string>a;
    
    if(i2-i1>=0)
        d=i2-i1;
    else
        u=i1-i2;
    if(j2-j1>=0)
        r=j2-j1;
    else
        l=j1-j2;
    //1
    if(l>=0 && u>=0)
    {
        while(l>=1 && u>=2)
        {
            a[k++]="UL";
            l--;
            u-=2;
        }
        while(l>0)
        {
            a[k++]="L";
            l-=2;
        }
        if(l!=0 || u!=0)
            cout<<"Impossible\n";
        else
        {
            cout<<k<<endl;
            for(int i=0;i<k;i++)
                cout<<a[i]<<" ";
            cout<<endl;
        }
    }
    //2
    else if(r>=0 && u>=0)
    {
        while(r>=1 && u>=2)
        {
            a[k++]="UR";
            r--;
            u-=2;
        }
        while(r>0)
        {
            a[k++]="R";
            r-=2;
        }
        if(r!=0 || u!=0)
            cout<<"Impossible\n";
        else
        {
            cout<<k<<endl;
            for(int i=0;i<k;i++)
                cout<<a[i]<<" ";
            cout<<endl;
        }
    }
    //3
    else if(l>=0 && d>=0)
    {
        while(l>=1 && d>=2)
        {
            a[k++]="LL";
            l--;
            d-=2;
        }
        while(l>0)
        {
            a[k++]="L";
            l-=2;
        }
        if(l!=0 || d!=0)
            cout<<"Impossible\n";
        else
        {
            cout<<k<<endl;
            for(int i=0;i<k;i++)
                cout<<a[i]<<" ";
            cout<<endl;
        }
    }
   else  if(r>=0 && d>=0)
    {
        while(r>=1 && d>=2)
        {
            a[k++]="LR";
            r--;
            d-=2;
        }
        while(r>0)
        {
            a[k++]="R";
            r-=2;
        }
        if(r!=0 || d!=0)
            cout<<"Impossible\n";
        else
        {
            cout<<k<<endl;
            for(int i=0;i<k;i++)
                cout<<a[i]<<" ";
            cout<<endl;
        }
    }
    return 0;
}