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Problem
You are given a string S and two characters A and B. Replace the **first occurrence** of character A with character B in S and print the result.
Input format
Input
input.txt
- String S (length 1–100, lowercase letters) - Two characters A and B
Output format
Output
output.txt
- String after replacement
Example
input
banana a e
output
benana
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Sample cases (from the problem)
Sample Case 1
Input
banana a e
Expected output
benana
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