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#!/usr/bin/env python3
import re
import sys
def valid_number(s: str) -> bool:
"""Check if the given string is a valid number.
Args:
s (str): The supplied string.
Returns:
bool: True if the string is a valid number, False otherwise.
"""
return bool(re.search(r'^[+-]?([0-9]+\.?[0-9]*|\.[0-9]+)([eE][+-]?[0-9]+)?$', s))
def main():
result = valid_number(sys.argv[1])
print('true' if result else 'false')
if __name__ == '__main__':
main()
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