Problem
Given a string S with words separated by spaces, print the sentence with the last word removed. If only one word, print an empty line.
Input format
Input
input.txt
- String S (up to 100 chars)
Output format
Output
output.txt
- Sentence without last word
Example
input
machine learning ai
output
machine learning
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Sample cases (from the problem)
Sample Case 1
Input
machine learning ai
Expected output
machine learning
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