<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_speech_text(self, text):
 """Set response output speech as plain text type. Args: text: str. Response speech used when type is 'PlainText'. Cannot exceed 8,000 characters. """

        self.response.outputSpeech.type = 'PlainText'
        self.response.outputSpeech.text = text