#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n,a,b,c,d;
    cin>>n>>a>>b>>c>>d;
    int ud=c-a;
    int lr=d-b;
    //cout<<lr<<" "<<ud;
    int alr=abs(lr);
    int aud=abs(ud);
    int count=0,s=0;
    if(aud%2)
    {
        cout<<"Impossible\n";
        return 0;
    }
    else
    {
        
        if(lr<0&&ud<0)
        {
        while(alr&&aud)
        {
            count++;
            aud=aud-2;
            alr=alr-1;
        }
        if((alr<0)||(aud%2))
        {
            cout<<"Impossible\n";
            return 0;
        }
        else
        {
            
            while(alr)
            {
                s++;
                //cout<<"L ";
                alr=alr-2;
            }
            cout<<count+s<<"\n";
            for(int i=0;i<count;i++)
                {
                    cout<<"UL ";
                }
            for(int i=0;i<s;i++)
            {
                cout<<"L ";
            }
        }
        }
        if(lr>0&&ud<0)
        {
            while(alr&&aud)
        {
            count++;
            aud=aud-2;
            alr=alr-1;
        }
        if((alr<0)||(aud%2))
        {
            cout<<"Impossible\n";
            return 0;
        }
        else
        {
            
            while(alr)
            {
                s++;
                //cout<<"R ";
                alr=alr-2;
            }
            cout<<count+s<<"\n";
            for(int i=0;i<count;i++)
                cout<<"UR ";
            for(int i=0;i<s;i++)
                cout<<"R ";
        }
        }
        if(lr>0&&ud>0)
        {
            while(alr&&aud)
        {
            count++;
            aud=aud-2;
            alr=alr-1;
        }
        if((alr<0)||(aud%2))
        {
            cout<<"Impossible\n";
            return 0;
        }
        else
        {
            while(alr)
            {
                s++;//cout<<"R ";
                alr=alr-2;
            }
            cout<<count+s<<"\n";
            for(int i=0;i<count;i++)
                cout<<"LR ";
            for(int i=0;i<s;i++)
                cout<<"R ";
        }
        }
        if(lr<0&&ud>0)
        {
            while(alr&&aud)
        {
            count++;
            aud=aud-2;
            alr=alr-1;
        }
        if((alr<0)||(aud%2))
        {
            cout<<"Impossible\n";
            return 0;
        }
        else
        {
            
            while(alr)
            {
                s++;
                //cout<<"R ";
                alr=alr-2;
            }
            cout<<count+s<<"\n";
            for(int i=0;i<count;i++)
                cout<<"LL ";
            for(int i=0;i<s;i++)
                cout<<"L ";
        }
        }
    }
    return 0;
}