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 solve():
    #n = int(input())
    n,m = input().split()
    a = list(map(int, input().split()))
    b = list(map(int, input().split()))
    n = int(n)
    m = int(m)
    dic = set()
    ans = ""
    for i in a:
        if i not in dic:
            dic.add(i)
    for i in b:
        if i in dic:
            print("YES")
            return (1,i)
    return "NO"
    
if __name__=="__main__":
    t = int(input())
    for i in range(t):
        a,b = (solve())
        print(a,b)