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 main(): 
    n = int(input())

    for _ in range(n):
        input()
        x = list(map(int,input().split()))
        y = list(map(int, input().split()))
        done = False
        for char in x:
            if char in y:
                print("YES")
                print("1 "+ str(char))
                done = True
                break
        if not done:
            print("NO")
        

main()