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 i in range(0,t):
    p, q = input('').split(' ')
    n = int(p)
    m = int(q)
    a = list(map(int,input('').strip().split()))
    b = list(map(int,input('').strip().split()))
    c = list(set(a).intersection(b))
    if len(c)==0:
        print('NO')
    else:
        print('YES')
        print('1 '+str(c[0]))