Problem
Given a string S containing lowercase letters and digits, reverse only the letters in S. Keep digits in their original positions.
Input format
Input
input.txt
- String S (1–100, lowercase and digits)
Output format
Output
output.txt
- The string after reversing letters only
Example
input
a1b2c3
output
c1b2a3
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Sample cases (from the problem)
Sample Case 1
Input
a1b2c3
Expected output
c1b2a3
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