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

Number_Of_Arrays = int(input())
def func():
    size_of_array = input().split()
    array1 = input().split()
    array2 = input().split()
    for k in array1:
        for j in array2:
            if k==j:
                print('YES')
                print('1',j)
                return
    print("NO")
for i in range(Number_Of_Arrays):
    func()
        