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


tot = int(input().strip())
while tot > 0:
    n, m = [int(x) for x in input().strip().split(' ', 1)]
    a = [int(x) for x in input().strip().split(' ')]
    b = [int(x) for x in input().strip().split(' ')]
    c = set(a).intersection(set(b))
    # print(c, set(a), set(b))
    if c:
        print('YES')
        print(1, list(c)[0])
    else:
        print('NO')
    tot -= 1