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 abc(n,arr,m,brr):
    arr=set(arr)
    brr=set(brr)
    x=arr.intersection(brr)
    if len(x)==0:
        print("NO")
    else:
        print("YES")
        print("1 ",x.pop())


t=int(input())
while t!=0:
    N,M=input().split()
    n=int(N)
    m=int(M)
    arr=[int(item) for item in input().split()]
    brr=[int(item) for item in input().split()]
    abc(n,arr,m,brr)
    t=t-1