def _errorr_input(endfin, pendfin, errorrout, mat,
                  ign=2, iwt=2, temp=293.6, iprint=False,
                  **kwargs):
    """Write acer input for fast data.
    
    Parameters
    ----------
    endfin : `int`
        tape number for input ENDF-6 file
    pendfin : `int`
        tape number for input PENDF file
    errorrout : `int`
        tape number for output ERRORR file
    mat : `int`
        MAT number
    ign : `int`
        neutron group option (default is 2, csewg 239-group structure)
    iwt : `int`
        weight function option (default is 2, constant)
    temp : `float`
        temperature in K (default is 293.6 K)
    iprint : `bool`
        print option (default is `False`)

    Returns
    -------
    `str`
        acer input text
    """
    text = ["errorr"]
    text += ["{:d} {:d} 0 {:d} 0 /".format(endfin, pendfin, errorrout)]
    text += ["{:d} {:d} {:d} {:d} 1 /".format(mat, ign, iwt, int(iprint))]
    text += ["{:d} {:.1f} /".format(int(iprint), temp)]
    text += ["0 33 /"]
    return "\n".join(text) + "\n"