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 scs(X, Y, m, n):
    if m == 0 or n == 0: 
       return -1; 
    else:
        for x in X:
            if x in Y:
                return x 




t = int(input())

for _ in range(t):
    a_len, b_len = [int(x) for x in input().split(' ')]
    a = [int(x) for x in input().split()]
    b = [int(x) for x in input().split()]
    result = scs(a, b, a_len, b_len)
    if result == -1 or result == None:
        print('NO')
    else:
        print('YES')
        print('1 {}'.format(result))