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 solution(arr1, arr2):
    res = 'No'
    for e1 in arr1:
        if res != 'No':
            break
        for e2 in arr2:
            if e1 == e2:
                res = 'Yes\n1 ' + str(e1)
                break
    return res


def main():
    for test in range(int(input())):
        _, _ = map(int, input().split())
        arr1 = list(map(int, input().split()))
        arr2 = list(map(int, input().split()))
        result = solution(arr1, arr2)
        print(result)


if __name__ == '__main__':
    main()
