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(t):
    n, m = map(int, input().split())
    a = list(map(int, input().split()))
    b = list(map(int, input().split()))
    res = 0
    i = 0
    if n < m:
        while i < n and a[i] not in b:
            i += 1
            if i == n:
                print('NO')
            else:
                print('YES')
                print('1 ' + str(a[i]))
    else:
        while i < m and b[i] not in a:
            i += 1
            if i == m:
                print('NO')
            else:
                print('YES')
                print('1 ' + str(b[i]))
