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 i in range(t):
    c=0
    n,m=input().split()
    a=list(map(int,input().split()))
    b=list(map(int,input().split()))
for i in a:
    c+=1
    if i in b:
        print("YES")
        print("1 ",i)
        break
    if c==len(a):
        print("NO")
    


# In[ ]:




