#include<bits/stdc++.h> using namespace std; int t,n,a[120],s,ans,w; int main(){ cin>>t; while(t--){ cin>>n,ans=s=110; for(int i=1;i<=n;i++)cin>>a[i],s=min(s,a[i]); for(int i=1;i<=n;i++)if(a[i]-s)ans=min(ans,a[i]); if(ans-110)cout<<ans; else cout<<"NO"; cout<<"\n"; } return 0; }