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 fuck(A,B):
    s=set(A)
    for i in B:
        if i in s:
            print("YES")
            print(1," ",i)
            return
    print("NO")
t=int(input())
for i in range(t):
    n,m=input().split()
    n=int(n)
    m=int(m)
    A=[int(i) for i in input().split()][:n]
    B=[int(i) for i in input().split()][:m]
    fuck(A,B)