#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n;
    cin>>n;
    vector<int>v1;
    int i;
    int t;
    int count1=0;
    int count2=0;
    int sub;
    int step;
    for(i=1;i<=4;i++)
    {
        cin>>t;
        v1.push_back(t);
    }
    if(v1.at(2)<v1.at(4))
        cout<<"Impossible"<<"\n";
    else
    {
        if(v1.at(1)>v1.at(3))
        {
            while(v1.at(1)!=v1.at(3))
            {
                v1.at(1)-=2;
                v1.at(2)-=1;
                count1++;
            }
            if(v1.at(2)>v1.at(4))
            {
                sub=v1.at(4)-v1.at(2);
            }
            step=sub/2;
            for(int k=1;k<=count1;k++)
                cout<<"UL"<<" ";
            for(int k=1;k<=step;k++)
                cout<<"L"<<" ";
        }
        else
        {
            while(v1.at(1)!=v1.at(3))
            {
                v1.at(1)+=2;
                v1.at(2)+=1;
                count2++;
            }
            if(v1.at(2)>v1.at(4))
            {
                sub=v1.at(4)-v1.at(2);
            }
            step=sub/2;
            for(int k=1;k<=count2;k++)
                cout<<"LL"<<" ";
            for(int k=1;k<=step;k++)
                cout<<"L"<<" ";
        }
    }
    return 0;
}