Problem
Given a string S consisting of digits and lowercase letters, calculate the sum of all digit characters in S.
Input format
Input
input.txt
- String S (1–100, lowercase letters and digits)
Output format
Output
output.txt
- The sum of all digits in S
Example
input
ab2c3d7
output
12
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Sample cases (from the problem)
Sample Case 1
Input
ab2c3d7
Expected output
12
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