#include<bits/stdc++.h>

using namespace std;


void solve()
{
    string first,s;
    int n;

    cin>>n>>first;

    int movef=0;
    int moves=0;
    for (int i=1;i<=n;i++)
    {
        cin>>s;
        if (s[0]==s[s.size()-1])
            if (s[0]=='0') movef++; else moves++;
    }

    if (first=="Dee")
    {
         if (movef<=moves) printf("Dee\n"); else printf("Dum\n");
    } else
    {
        if (moves<=movef) printf("Dum\n"); else printf("Dee\n");
    }
    return ;
}
int main()
{

    int t;
    cin>>t;

    while(t--)
        solve();
    return 0;
}