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#!/usr/bin/env python3
import sys
def replace_all_questions(input_string: str) -> str:
solution = ''
for idx, char in enumerate(input_string):
if char != '?':
solution += char
continue
# Get the surrounding characters
letters = []
if idx > 0:
letters.append(input_string[idx - 1])
if idx < len(input_string) - 1:
letters.append(input_string[idx + 1])
# Replace '?' with 'a', 'b', or 'c' based on surrounding characters
if 'a' not in letters:
solution += 'a'
elif 'b' not in letters:
solution += 'b'
else:
solution += 'c'
return solution
def main():
result = replace_all_questions(sys.argv[1])
print('"' + result + '"')
if __name__ == '__main__':
main()
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