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

t = int(input())

def subseq(a, b):
    for j in a:
        if j in b:
            return("YES\n1 " + str(j))

    return("NO")

for i in range(t):
    a_len, b_len = (int(x) for x in input().split())
    a = [int(x) for x in input().split()]
    b = set([int(x) for x in input().split()])

    print(subseq(a,b))
