#include<bits/stdc++.h>
using namespace std;
typedef long long int uli;
int rint(char nxt){
  char ch=getchar();
  int v=0;
  int sgn=1;
  if(ch=='-')sgn=-1;  
  else{
    assert('0'<=ch&&ch<='9');
    v=ch-'0';
  }
  while(true){
    ch=getchar();
    if('0'<=ch && ch<='9')v=v*10+ch-'0';
    else{
      assert(ch==nxt);
      break;
    }
  }
  return v*sgn;
}
string rword(char nxt){
  string ans="";
  while(true){
    char ch=getchar();
    if(ch==nxt)break;
    ans.push_back(ch);
  }
  return ans;
}
int main(){
//  freopen("secret/0.in","r",stdin);
//  freopen("secret/0.out","w",stdout);
//  freopen("sample.in","r",stdin);
  int t=rint('\n');
  assert(1<=t&&t<=500);
  while(t--){
    int n=rint(' ');
    assert(1<=n&&n<=50);
    string s=rword('\n');
    assert(s=="Dee" || s=="Dum");
    int cnt[2]={0,0};
    for(int i=0;i<n;i++){
      string b=rword('\n');
      for(char ch:b)assert(ch=='0' || ch=='1');
      cnt[b[0]-'0']+=(b[0]==b.back());
    }
    string players[]={"Dee","Dum"};
    if(s=="Dum"){
      swap(players[0],players[1]);
      swap(cnt[0],cnt[1]);
    }
    if(cnt[0]>cnt[1])cout<<players[1]<<endl;
    else cout<<players[0]<<endl;
  }
  assert(getchar()==EOF);
  return 0;
}