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

def common_data(list1, list2): 
    result = False
    for x in list1: 
        for y in list2: 
            if x == y: 
                result = x
                print("YES")
                print(1,x)
                flag=1
                break
            else:
                flag=0
        if flag==1:
            break
    if flag==0:
        print("NO")
    
for _ in range( int(input())):
    n,m=map(int,input().split())
    a=list(map(int,input().split()))
    b=list(map(int,input().split()))
    common_data(a, b)
    
    
            

            
    
