Fudge

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#!/usr/bin/env python3

import sys


def lines(filename):
    with open(filename, 'r') as f:
        for line in f:
            if not line.startswith('-'):
                yield line.rstrip('\n')


def main(filename):
    print('v=DKIM1;k=rsa;p={}'.format(''.join(lines(filename))))


if __name__ == '__main__':
    if len(sys.argv) != 2:
        print('Usage: {} <public key>'.format(sys.argv[0]))
        sys.exit(0)

    main(sys.argv[1])