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 f(l1,l2):
    for i in l1:
        if i in l2:
            return i
    return "NO"
        



a=int(input())
for i in range(a):
    y,z=map(int,input().split())
    l1=list(map(int,input().split()))
    l2=list(map(int,input().split()))
    k=f(l1,l2)
    if k=="NO":
        print("NO")
    else:
        print("YES")
        print(1,k)
    


    
