03. Find Occurrences of Word in Sentence

import re
string_input = input()
occurrences = input()
occurrences_count = []

pattern = f"\\b{occurrences}\\b"

matches = re.findall(pattern, string_input, re.IGNORECASE)

if matches:
    occurrences_count.extend(matches)

print(len(occurrences_count))