<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def find_type(self, txt):
 """ top level function used to simply return the ONE ACTUAL string used for data types """

        searchString = txt.upper()
        match = 'Unknown'
        for i in self.lst_type:
            if searchString in i:
                match = i
        return match