#include<bits/stdc++.h>
using namespace std;
int main(){
int n;cin>>n;
while(n--){
int a;cin>>a;
int sha[a];
for (int i = 0; i < a; i++) {
/* code */
cin>>sha[i];
}
sort(sha,sha+a);
int cnt=1;
for (int i = a-1; i >0 ; i--) {
/* code */
if(sha[i]==sha[i-1])cnt++;
else break;
}
if(cnt>1){
cout<<cnt<<endl;
}
else cout<<sha[a-1]<<endl;
}
}