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 ques1(a,b,n,m):
    for i in range(n):
        for j in range(m):
            if a[i] == b[j]:
                print("YES")
                print(1,end=" ")
                print(a[i])
                return
            
    print("NO")

t = int(input())
for i in range(t):
    n,m = [int(i) for i in input().split()]
    a = [int(i) for i in input().split()]
    b = [int(i) for i in input().split()]
    ans = ques1(a,b,n,m)
    ans