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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 buildFITSName(geisname):
 """Build a new FITS filename for a GEIS input image."""


    # User wants to make a FITS copy and update it...
    _indx = geisname.rfind('.')
    _fitsname = geisname[:_indx] + '_' + geisname[_indx + 1:-1] + 'h.fits'

    return _fitsname