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 hello():
    from collections import Counter
    a, b = map(int, input().split(' '))
    arr1 = list(map(int, input().split(' ')))
    arr2 = list(map(int, input().split(' ')))
    arr1.sort()
    f = set(arr1)
    g = set(arr2)
    arr2.sort()
    flag = False
    ans = []
    first = Counter(f)
    second = Counter(g)
    for i in first:
        if i in second:
            # print('YES')
            ans.append(first[i])
            ans.append(i)
            return ans
        else:
            continue

    return ans


for _ in range(int(input())):
    s = hello()
    if len(s) != 0:
        print('YES')
        print(*s)
    else:
        print('NO')