import sys

def erase_commented_lines(filename, out):
    with open(filename, 'r') as file:
        lines = file.readlines()

    lines = [line for line in lines if not line.startswith('#')]

    with open(out, 'w') as file:
        file.writelines(lines)

def main():
    if len(sys.argv) != 3:
        print(f'Usage: python3 {sys.argv[0]} <in> <out>')
        return

    erase_commented_lines(sys.argv[1], sys.argv[2])

if __name__ == '__main__':
    main()