class numbar:
    def __init__(self, num):
        self.__age = num
    def get(self):
        return self.__age
class ECHO:
    def __init__(self,wen):
        print(wen,end="")
class Set:
    def __init__(self):
        self.__k = []
    def push(self, k):
        self.__k.append(numbar(k))
    def echo(self):
        P=ECHO(self.__k[-1].get())
class write:
    def __init__(self,aho):
        A=Set()
        A.push(aho)
        A.echo()
for name in "hello world":
    write(name)