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

'''Author: Pranit Bhujel'''
ls = lambda : list(map(int, input().split()))
ip = lambda : int(input())
r = lambda a : range(a)

'''imports if any'''


'''showtime'''
if __name__=="__main__":
    t = ip()
    for _ in r(t):
        m, n = ls()
        arr_m = ls()
        arr_n = ls()
        
        sm = set(arr_m)
        sn = set(arr_n)
        
        p = False
        for i in sm:
            if i in sn:
                p = True
                print("YES")
                print("1 " + str(i))
        if not p:
            print("NO")
