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 = map(int,input().split())
    a = [int(x) for x in input().split()]
    b = [int(x) for x in input().split()]
    c = 0
    count = 0
    for i in a:
        if i in b:
            c += i
            break
        else:
            count += 1
    if count == len(a):
        print("NO")
    else:
        print("YES")
        print(1,c)
        
            
        
        
        
        
    
    
    
    

    

        
            
    
        
    
    