#include <bits/stdc++.h>
using namespace std;
 
// Speed
#define fast_io ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
 
// Typedefs
#define int long long
#define pb push_back
#define ff first
#define ss second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) ((int)(x).size())
#define endl '\n'
 
// Loops
#define rep(i,a,b) for(int i=a;i<b;++i)
#define each(x, a) for (auto &x : a)
 
int distinct_count(vector<int> &v) {
    unordered_set<int> st(all(v));
    return st.size();
}
 
// Logic
void solve() {
    int n;
    cin>>n;
    vector <int> a(n);
    rep(i,0,n) cin>>a[i];
    int b=distinct_count(a);
    int c;
    sort(all(a));
    rep(i,0,n){
    	if(a[i]>=b){
    		c=a[i];
    		break;
    	}
    }
    cout<<c<<endl;
}
 
 
// Main
int32_t main() {
    fast_io;
    int t;
    cin>>t;
    while (t--) solve();
    return 0;
}
 

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5
6
1 1 1 1 1 1
1
1000
5
8 10 15 20 25
8
2 5 2 4 1 2 5 3
6
40 4 1 95 8 40