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

from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    T = int(input())
    for _ in [0] * T:
        N, M = map(int, input().split())
        A = set(map(int, input().split()))
        B = set(map(int, input().split()))

        ans = list(A & B)
        if ans:
            print("YES")
            print(1, ans[0])
        else:
            print("NO")


main()
