9.1.2. Magic dates

# from datetime import date as
# import time as _time
# import python 3.7
import datetime
from datetime import timedelta
from math import floor

first_year = int(input())
second_year = int(input())
number_to_search_for = int(input())
found = False

date = datetime.datetime(first_year, 1, 1)

while date.year <= second_year:
    d1 = floor(date.day / 10)
    d2 = date.day % 10
    d3 = floor(date.month / 10)
    d4 = date.month % 10
    d5 = floor(date.year / 1000)
    d6 = floor(date.year / 100) % 10
    d7 = floor(date.year / 10) % 10
    d8 = date.year % 10

    weight = d1*(d2+d3+d4+d5+d6+d7+d8) + \
        d2*(d3+d4+d5+d6+d7+d8) + \
        d3*(d4+d5+d6+d7+d8) + \
        d4*(d5+d6+d7+d8) + \
        d5*(d6+d7+d8) + \
        d6*(d7+d8) + \
        d7*d8
    if weight == number_to_search_for:
        print(str(d1)+str(d2)+"-"+str(d3)+str(d4)+"-"+str(d5)+str(d6)+str(d7)+str(d8))
        found = True
    date = date + timedelta(days=1)
if not found:
    print("No")