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 multiple_input(): return map(int, input().split())


def list_input(): return list(map(int, input().split()))


for _ in range(int(input())):
    n, m = multiple_input()
    a = list_input()
    b = list_input()
    d = {}
    for i in a:
        d[i] = 1
    flag = 0
    for i in b:
        if i in d:
            flag = 1
            print("YES")
            print("1 ", i)
            break
    if flag == 0:
        print("NO")