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

# cook your dish here
for _ in range(int(input())):
    count=0
    n,m=map(int,input().split())
    a=list(map(int, input().split()))
    b=list(map(int, input().split()))
    a_set = set(a) 
    b_set = set(b) 
  
    if (a_set & b_set): 
        count+=1
        
    else: 
        print("NO")
    
    lst3 = [value for value in a if value in b] 
    print("YES")
    if len(lst3)>1:
        print("1",lst3[0])
    elif len(lst3)==1:
        print(len(lst3),*lst3)