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


for t in range(int(input())):
    n, m = cin()
    a = set(list(cin()))
    b = list(cin())
    ans = 'NO'
    c = []
    for i in b:
        if i in a:
            ans = 'YES'
            c = [1, i]
            break
    print(ans)
    if c:
        print(*c)
