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 _ in range(t):
    n,m = map(int,input().split())
    a = [int(i) for i in input().split()]
    b = [int(i) for i in input().split()]
    d = {}
    for i in range(n):
        d[a[i]] = 1
    l = 0
    ans = 0
    for i in range(m):
        if b[i] in d.keys():
            l = 1
            ans = b[i]
    if l == 0:
        print('NO')
    else:
        print('YES')
        print(l,ans)