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

T = int(input())
while(T):
    n,m = map(int,input().strip().split())
    a = list(map(int,input().strip().split()))
    b = list(map(int,input().strip().split()))
    set_a = set(a)
    set_b = set(b)
    set_result = set_a.intersection(set_b)
    if len(set_result)==0:
        print('NO')
    else:
        print('YES')
        print(1,set_result.pop())
    T -= 1