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 task_A():
    t = int(input())
    for _ in range(t):
        n, m = map(int, input().split())
        a = set(map(int, input().split()))
        b = set(map(int, input().split()))
        
        intersec = a & b
        if len(intersec) == 0:
        	print('NO')
        else:
        	print('YES')
        	print(1, list(intersec)[0])

def main():
    task_A()

if __name__ == '__main__':
    main()