Add up the individual digits of a number.
Input
A single line containing a non-negative integer n.
Output
The sum of the digits of n.
Sum of Digits
Easymath
Examples
Example 1
- Input
1234
- Output
10
1 + 2 + 3 + 4 = 10.
Example 2
- Input
0
- Output
0
The only digit is 0.
Example 3
- Input
99
- Output
18
9 + 9 = 18.
Constraints
- 0 <= n < 10^18 (treat it as text so it never overflows).
Hints
Reveal hint 1
You can treat the number as a string and add up its digit characters.
Reveal hint 2
Each character c can be turned into its numeric value and summed.
Reference solution (spoiler — try it yourself first)
Approach
Read the number as text and sum the numeric value of each digit character.
s = input()
print(sum(int(c) for c in s if c.isdigit()))
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