# coding:utf-8
        #symmetric_difference 対称差
        #Return a set that contains all items from both sets, except items that are present in both sets
        x = {"apple", "banana", "cherry"}
        y = {"google", "microsoft", "apple"}
        
        z = x.symmetric_difference(y)
        
        print(z)
        
        #Remove the items that are present in both sets, 
        # AND insert the items that is not present in both sets
        x = {"apple", "banana", "cherry"}
        y = {"google", "microsoft", "apple"}
        
        x.symmetric_difference_update(y)
        
        print(x)