Digit sum of an ID

Problem

A bank form checks an ID number by adding all of its digits. Given an ID n, print the sum of its digits.

Example

Input

Output

1 + 2 + 3 = 6.

Try the problem first. Open one hint at a time.

Hint 1

The last digit of n is n % 10.

Hint 2

Add the last digit to a total, then remove it with n // 10, and repeat until n is 0.

Write your Python code, run it on the examples and submit it to hidden tests.