Problem
Given a string S consisting of pairs: letter followed by a digit (e.g., a3b2), expand it so that each letter is repeated as per its digit.
Input format
Input
input.txt
- String S (length even, 2–20, lowercase and digits, always valid)
Output format
Output
output.txt
- Expanded string
Example
input
a3b2
output
aaabb
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Sample cases (from the problem)
Sample Case 1
Input
a3b2
Expected output
aaabb
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