某人三天打渔两天晒网，假设他从1990年1月1日开始打渔三天，然后晒网两天，请编程回答任意的一天他在打渔还是晒网。 A boy works for 3 days while has a 2 days off. If he is working on 1st, Jan, 1990, then for a date entered from the keyboard, please write a program to determine what the boy is doing, working or resting? Examples of input and output: 1)Input: 1990-01-05 Output: He is having a rest. 2)Input: 1990-01-07 Output: He is working. 3)Input: 1990-01-33 Output: Invalid input. ***输入数据格式***："%4d-%2d-%2d" ***输出数据格式***："Invalid input."或"He is having a rest." 或"He is working."

可以使用datetime库中的datetime.date()函数来处理日期，先将输入的字符串转换为日期格式，然后计算与1990年1月1日相差的天数，再根据天数对5取模判断是打渔还是晒网。代码如下：

import datetime

input_date = input()
try:
    year, month, day = map(int, input_date.split('-'))
    current_date = datetime.date(year, month, day)
    start_date = datetime.date(1990, 1, 1)
    days = (current_date - start_date).days
    if days % 5 < 3:
        print("He is working.")
    else:
        print("He is having a rest.")
except ValueError:
    print("Invalid input.")

输入格式示例：1990-01-05，输出格式示例：He is having a rest.