age = int(input("Please input your age:\n"))
if age < 2:
    print("原来你是个婴儿！！")
elif age < 4:
    print("原来你是蹒跚学步！！")
elif age < 20:
    print("原来你是青少年！！")
elif age < 65:
    print("原来你是成年人！！")
else:
    print("原来你是老年人！！")