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 = list(map(int, input().split()))
    b = list(map(int, input().split()))
    ans = 'NO'
    for j in a:
        if j in b:
            ans = 'YES'
            k = j
            break
    print(ans)
    if ans == 'YES':
        print(1, k)
    
        
    
        
            
            
            
        
            
            
            
            
            
            

    
        
        
        
        
    
    
        
            
    
        
        
                
            
            
            
            
    
            
                
        
        
    
            
    
        
            
        
    

    
    
    
           
        
        
        
            

        
    
        
    
    
    
