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 collections import Counter
def scs(arr1,arr2,n,m):
    c = Counter(arr2)
    c = dict(sorted(c.items(), key=lambda x:x[1]))
    for i in arr1:
        if i in c:
            return 1,i
    return 0,0
for _ in range(int(input())):
    n,m = map(int,input().split())
    arr1 = input().split()
    arr2 = input().split()
    l,el = scs(arr1,arr2,n,m)
    if l == 0:
        print("NO")
    else:
        print("YES")
        print(1,el)