age = int(input('请输入年龄'))
if age < 2:
    print('这人还是个婴儿')
if age >= 2 and age < 4:
    print('这人正在庞珊学步')
if age >= 4 and age < 13:
    print('这人是儿童，可以参加留意儿童节')
if age >= 13 and age <20:
    print('这人是青少年')
if age >=20 and age < 65:
    print('这人是成年人')

