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
input=lambda :stdin.readline().strip()
for _ in range(int(input())):
    n,m=[int(i) for i in input().split()]
    lst1=[int(i) for i in input().split()]
    lst2=[int(i) for i in input().split()]
    nk=0
    lst1=set(lst1)
    lst2=set(lst2)
    for i in lst1:
        if i in lst2:
            print('YES')
            print(1,i)
            nk=1
            break
    if nk==0:
        print('NO')
