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 c in range(0,int(input())):
    n,m = input().split(' ')
    n = int(n)
    m = int(m)
    a = input().split(' ')
    b = input().split(' ')
    d = -1
    f = 0
    while d < n-1:
        if f == 1:
            break
        e = -1
        d = d + 1
        a[d] = int(a[d])
        while e < m-1:
            e = e + 1
            b[e] = int(b[e])
            if a[d] == b[e]:
                print(1,'YES')
                print(a[d])
                f=f+1
                break
    if f == 0:
        print('NO')
