Sum of Digits

MEDIUMArithmetic

Read a positive integer. Output the sum of its digits.

Input: A positive integer. Output: The sum of its digits.

Example:

Input:  123
Output: 6

(because 1 + 2 + 3 = 6)

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Sample Test Cases

Test 1: 1+2+3

Inputs: 123

Expected: 6

Test 2: 9+9+9+9

Inputs: 9999

Expected: 36

Test 3: 1+0+0

Inputs: 100

Expected: 1

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