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 case():
    n,m=map(int,input().split())
    A=[int(i)for i in input().split()]
    B=[int(i)for i in input().split()]
    for i in range(n):
        for j in range(m):
            if(A[i]==B[j]):
                print("YES")
                print(1,A[i])
                return
    print("NO")
def sol():
    t=int(input())
    for _ in range(t):
        case()
if(__name__=='__main__'):
    sol()
