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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 call(self, x, *args):
 """Apply _only_ the convert_token function of the current pipeline to the input. If the input is a list, a list with the results of applying the `convert_token` function to all input elements is returned. Arguments: x: The input to apply the convert_token function to. Positional arguments: Forwarded to the `convert_token` function of the current Pipeline. """

        if isinstance(x, list):
            return [self.convert_token(tok, *args) for tok in x]
        return self.convert_token(x, *args)