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

t = int(input()) # num of testcase

for i in range(t):
    size_a, size_b = [int(s) for s in input().split(' ')]
    a = [int(s) for s in input().split(' ')]
    b = [int(s) for s in input().split(' ')]
    set_a = set(a)
    set_b = set(b)

    has_common = False
    for j in range(1, 1000):
        if j in set_a and j in set_b:
            has_common = True
            print('YES')
            print('1 {}'.format(j))
            break
    if not has_common:
        print('NO')

