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

for i in range(int(input())):
    m,n = list(map(int,input().split()))
    m_arr = list(map(int,input().split()))
    n_arr = list(map(int,input().split()))

# for i in range(1):
#     m,n = [4,5]
#     m_arr = [10,8,6,4]
#     n_arr = [1,2,3,4,5]

    c=False
    for i in range(m):
        if m_arr[i] in n_arr:
            print('YES')
            print(1,m_arr[i])
            c=True
            break
    if c==False:
        print('NO')
