Problem
Given a string S (words separated by spaces), count the number of distinct words.
Input format
Input
input.txt
- String S (up to 100 chars, lowercase, may have repeated words)
Output format
Output
output.txt
- Integer: number of distinct words
Example
input
cat dog cat mouse dog
output
3
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Sample cases (from the problem)
Sample Case 1
Input
cat dog cat mouse dog
Expected output
3
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