#include<bits/stdc++.h> using namespace std; int t,n,bot[120],in,tmp,ans; int main(){ cin>>t; while(t--){ memset(bot,0,sizeof bot); in=110,ans=-1; cin>>n; while(n--)cin>>tmp,bot[tmp]++,in=min(in,tmp); for(int i=in+1;i<=100;i++)if(bot[i]){ans=i;break;} if(ans+1)cout<<ans; else cout<<"NO"; cout<<"\n"; } return 0; }