class Age:
    def __init__(self, age):
        self.age = age
        
    def set_age(self, new_age):
        if new_age < 0 or new_age > 200:
            print("잘못된 입력입니다")
        else:
            self.age = new_age

p = Age(25)
print(p.age)

p.set_age(-5)
print(p.age)

p.set_age(300)
print(p.age)

p.set_age(30)
print(p.age)