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

#!/usr/bin/env python
# coding: utf-8

# In[5]:


T = int(input())
for t in range(T):
    n , m = [int(x) for x in input().split()]
    arr1 = [int(x) for x in input().split()]
    arr2 = [int(x) for x in input().split()]
    k = min(n,m)
    arr1.sort()
    arr2.sort()
    flag = 0
    for i in range(k):
        if arr1[i]==arr2[i]:
            flag =1
            res = arr1[i]
            print('YES')
            print(str(1) + ' ' + str(res))
            break
    if flag==0:
        print('NO')
        


# In[ ]:




