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())
for cases in range(t):
    s = input()
    L = [int(item) for item in s.split(' ')]
    a = input()
    b = input()
    a1 = [int(item) for item in a.split(' ')]
    b1 = [int(item) for item in b.split(' ')]
    flag = 0
    for num in a1:
        if num in b1:
            flag = 0
            print('YES')
            print(1,end=' ')
            print(num)
            break
        else:
            flag = 1
    if flag==1:
        print('NO')
