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 solve(arr1,arr2):
    for el in arr1:
        if arr2.count(el)>=1:
            print('YES')
            print('1 {}'.format(el))
            return
    print('NO')
while T>0: 
    n,m = [int(el) for el in input().split(' ')]

    arr1 = [int(el) for el in input().split(' ')]
    arr2 = [int(el) for el in input().split(' ')]

    solve(arr1,arr2)
    T-=1
    


    



