Problem
Given a string S, print S with all spaces replaced by underscores.
Input format
Input
input.txt
- String S (up to 100 chars)
Output format
Output
output.txt
- String with spaces replaced by underscores
Example
input
hello world test
output
hello_world_test
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Sample cases (from the problem)
Sample Case 1
Input
hello world test
Expected output
hello_world_test
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