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#!/usr/bin/env python3
from collections import defaultdict
import sys
def uncommon_words(*strings) -> list:
"""Find words that only occur once in one string, and don't appear in others
Params:
strings: One or more strings
Returns:
list: Words that meat the criteria
"""
freq = defaultdict(int)
# Compute the frequency of each word
for string in strings:
for word in string.split(' '):
freq[word] += 1
# Return the word(s) that appear only once
return [w for w in freq if freq[w] == 1]
def main():
result = uncommon_words(*sys.argv[1:])
if len(result) == 0:
# If there is no result, show an empty string
print("('')")
else:
print("('" + "', '".join(result) + "')")
if __name__ == '__main__':
main()
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