Sum of Digits

Problem Description

Given a non-negative integer N, write a program to calculate and print the sum of all its digits.

The sum of digits is obtained by adding each individual digit of the given number. For example, if the given number is 1234, the sum of its digits is 1 + 2 + 3 + 4 = 10.

If the number is 0, its sum of digits is 0.

Input Format

- A single integer N, representing the number whose digits need to be summed.

Output Format

- Print a single integer representing the sum of all digits of N.

Examples

Example 1:

Example 2:

Constraints

• The input number N will be a non-negative integer.
• The value of N will be in the range of 0 to 10^9 (inclusive).
• The number may contain one or more digits.
• The input will not contain any decimal points, special characters, or alphabetic characters.
• If N is 0, the sum of its digits will be 0.
• The output must be a non-negative integer representing the sum of all the digits of N.

12345

15

1001

2