func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int power(long long int x, long long int n, long long int p) {     long long int result = 1;     while (n > 0) {       if (n % 2 == 1) result = (result % p * x % p) % p;       x = (x % p * x % p) % p;       n = n / 2;     }     return result % p;   }   void solve() {     long long int n, m;     cin >> n >> m;     vector<long long int> cnt(1005);     for (long long int i = 0; i <= n - 1; i++) {       long long int a1;       cin >> a1;       cnt[a1] = 1;     }     for (long long int i = 0; i <= m - 1; i++) {       long long int a2;       cin >> a2;       if (cnt[a2] == 1) cnt[a2]++;     }     for (long long int i = 1; i <= 1000; i++) {       if (cnt[i] >= 2) {         cout <<  YES  << endl;         cout <<  1   << i << endl;         return;       }     }     cout <<  NO  << endl;     return;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     long long int t = 1;     cin >> t;     while (t--) {       solve();     }   }   