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#!/usr/bin/env python3
import re
import sys
import re
def b_after_a(s: str) -> bool:
"""
Checks if the string 's' contains the letter 'a' does not appear after a 'b'.
Args:
s (str): The input string to be checked.
Returns:
bool: True if the criteria is met, False otherwise.
"""
return re.search(r'^[^b]*b[^a]*$', s) is not None
def main():
result = b_after_a(sys.argv[1])
print(result)
if __name__ == '__main__':
main()
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