'Test asciized char for A-z.
Convert char to ascii, test for A-z.
Args:
char (chr): character to test
Return:
(str): char if A-z, else SYMBOLS'

def letter_or_symbol(self, char):

    if (not re.search('[a-zA-Z]', ascii_text(char))):
        return self.SYMBOLS
    else:
        return char
