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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def cnsfix(args):
 """ %prog cnsfix consensus-fix.out.FAILED > blacklist.ids Parse consensus-fix.out to extract layouts for fixed unitigs. This will mark all the failed fragments detected by utgcnsfix and pop them out of the existing unitigs. """

    from jcvi.formats.base import read_block

    p = OptionParser(cnsfix.__doc__)
    opts, args = p.parse_args(args)

    if len(args) != 1:
        sys.exit(not p.print_help())

    cnsfixout, = args
    fp = open(cnsfixout)
    utgs = []
    saves = []
    for header, contents in read_block(fp, "Evaluating"):
        contents = list(contents)
        utg = header.split()[2]
        utgs.append(utg)
        # Look for this line:
        #   save fragment idx=388 ident=206054426 for next pass
        for c in contents:
            if not c.startswith("save"):
                continue
            ident = c.split()[3].split("=")[-1]
            saves.append(ident)
    print("\n".join(saves))