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Problem
Given a string, count how many characters are digits (0-9).
Input format
Input
input.txt
- A single line with the string (up to 100 characters)
Output format
Output
output.txt
- A single integer: the number of digit characters
Example
input
abc1234x
output
4
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Sample cases (from the problem)
Sample Case 1
Input
abc1234x
Expected output
4
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