1
2 2
1 1
1 2
 1
1 3
3
1 2 3
 1
1 1
1000
1000
 1
2 2
2 2
2 2
 5
4 5
10 8 6 4
1 2 3 4 5
1 1
3
3
1 1
3
2
5 3
1000 2 2 2 3
3 1 5
5 5
1 2 3 4 5
1 2 3 4 5
 1
4 4
1 1 1 1
1 2 3 4
 1
2 3
1 1
1 2 3

YES
1 1
 YES
1 3
 YES
1 1000
 YES
1 2
 YES
1 4
YES
1 3
NO
YES
1 3
YES
1 1
 YES
1 1
 YES
1 1

import sys
import os.path

def solve():
    # code goes here!!         
    T = int(input())
    for tests in range(T):
        n,m = map(int,input().split())
        cnt = [False] * 1010
        for val in list(map(int,input().split())):
            cnt[val] = True
        ans = -1
        for val in list(map(int,input().split())):
            if cnt[val]: 
                ans = val
        if ans == -1 :
            print("NO")
        else :
            print("YES")
            print(1,ans)
        

def main():
    # comment when submit.
    if os.path.exists('test.inp') :
        sys.stdin = open("test.inp","r")
    solve()

if __name__ == '__main__':
    main()

