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

tests = int(input())
for t in range(tests):
    n, m = list(map(int, input().split()))
    ls_1 = list(map(int, input().split()))
    ls_1 = set(ls_1)
    ls_2 = list(map(int, input().split()))
    ls_2 = set(ls_2)
    res = [1]
    if len(ls_1.intersection(ls_2)) == 0:
        print('NO')
    else:
        print('YES')
        res.append(ls_1.intersection(ls_2).pop())
        print(' '.join(list(map(str, res))))
