<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def dex_ticker(self):
        ''' Simply grabs the ticker using the 
        steem_instance method and adds it
        to a class variable.
        '''
        self.dex = Dex(self.steem_instance())
        self.ticker = self.dex.get_ticker();
        return self.ticker