Problem
Given a string S, replace every digit character with '*' and print the result.
Input format
Input
input.txt
- String S (1–100, lowercase letters and digits)
Output format
Output
output.txt
- String with all digits replaced by '*'
Example
input
ab3c4d
output
ab*c*d
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Sample cases (from the problem)
Sample Case 1
Input
ab3c4d
Expected output
ab*c*d
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