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=[int(n) for n in input().split()]
    arr=[int(item) for item in input().split()]
    brr=[int(item) for item in input().split()]
    d=dict()
    for i in range(1001):
        d[i]=0
    for j in arr:
        d[j]=d[j]+1
    flag=0
    for k in brr:
        if(d[k]>0):
            s=k
            flag=1
            break
    if(flag==1):
        print("YES")
        print(s)
    else:
        print("NO")
        
        
        
        
   
        
  

       
            



