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

def main():
    t = int(input())
    for _ in range(t):
        n, m = map(int, input().split())
        a = set(map(int, input().split()))
        b = list(map(int, input().split()))
        ans = -1
        for i in b:
            if i in a:
                ans = i
                break
        if ans != -1:
            print('YES')
            print(1, ans)
        else:
            print('NO')

main()