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#!/usr/bin/env python
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# Sorts a spreadsheet based on a column
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import csv
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import sys
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def by_idx(list_, idxes): return [list_[i] for i in idxes]
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def cmp_nulls_last(*row_pair):
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    def repl(val):
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        if val == '': val = () # sorts > ''
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        return val
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    return cmp(*map(lambda row: map(repl, row), row_pair))
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def main():
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    col_nums = sys.argv[1:]
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    if col_nums == []:
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        raise SystemExit('Usage: '+sys.argv[0]+' col_num... <map >sorted_map')
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    col_nums = map(int, col_nums) # 0-based
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    # Sort map
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    reader = csv.reader(sys.stdin)
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    cols = reader.next()
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    def get_sort_by(row): return by_idx(row, col_nums)
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    rows = list(reader)
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    rows.sort(lambda *row_pair: cmp_nulls_last(*map(get_sort_by, row_pair)))
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    writer = csv.writer(sys.stdout)
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    writer.writerow(cols)
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    map(writer.writerow, rows)
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main()
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