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Problem
Given a string S containing digits and letters, insert a dash '-' between every pair of consecutive digits.
Input format
Input
input.txt
- String S (1–100)
Output format
Output
output.txt
- Modified string
Example
input
ab123c45
output
ab1-2-3c4-5
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Sample cases (from the problem)
Sample Case 1
Input
ab123c45
Expected output
ab1-2-3c4-5
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