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#!/usr/bin/env python3
import sys
def count_pairs(words: list) -> int:
"""Count the number of pairs of strings where one is reversed
Args:
words (list): A list of words
Returns:
int: The number of pairs
"""
count = 0
while words:
# Take one word from the list
word = words.pop()
# See if the reverse of it is also in the list
if word[::-1] in words:
count += 1
# Return the number of pairs
return count
def main():
result = count_pairs(sys.argv[1:])
print(result)
if __name__ == '__main__':
main()
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