#include<bits/stdc++.h>
using namespace std;
using ll = long long;
void solve(void)
{
    int n,m;
    cin>>n>>m;
    string s;
    for(int i=1;i<=n;i++)
    {
        cin>>s;
    }
    s="";
    int rev=0,len=0;
    for(int i=0;i<50000;i+=40)
    {
        for(int j=1;j<=20;j++)
        {
            len+=2;
            if(rev)
                s+="RD";
            else
                s+="LD";
        }
        rev^=1;
    }
    assert(s.length()<=50000);
    cout<<s<<endl;
}
int main(void)
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int t=1;
    while(t--)
    {
        solve();
    }
    return 0;
}