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#!/usr/bin/env python3
import re
import sys
def check_color(coords: str) -> bool:
'''Determine if a coordinate on a chess board is light'''
# Check if the position is valid
if not re.search('^[a-h][1-8]$', coords):
raise ValueError('Not a valid chess coordinate!')
if coords[0] in ('a', 'c', 'e', 'g') and int(coords[1]) % 2 == 0:
return True
if coords[0] in ('b', 'd', 'f', 'h') and int(coords[1]) % 2 == 1:
return True
return False
def main():
result = check_color(sys.argv[1])
print('true' if result else 'false')
if __name__ == '__main__':
main()
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