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#!/usr/bin/env python3
import sys
def good_string(input_string: str) -> str:
solution = input_string
while True:
for idx in range(0, len(solution)-1):
char = solution[idx]
# If the next two letters are the same but different case, remove them
if ((char.isupper() and solution[idx + 1] == char.lower()) or
(char.islower() and solution[idx + 1] == char.upper())):
solution = solution[:idx] + solution[idx + 2:]
break
else:
# No pairs were removed
break
return solution
def main():
result = good_string(sys.argv[1])
print('"' + result + '"')
if __name__ == '__main__':
main()
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