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

"""
Author: Q.E.D
Time: 2020-07-21 09:36:28
"""
T = int(input())
for _ in range(T):
    n, m = list(map(int, input().split()))
    a = list(map(int, input().split()))
    b = list(map(int, input().split()))
    a = set(a)
    ans = None
    for x in b:
        if x in a:
            ans = x
            break
    if ans is None:
        print('NO')
    else:
        print('YES')
        print(1, ans)