>>> consonants=t[1:4]+t[5:8]+t[9:14]+t[15+20]
Traceback (most recent call last):
File "<pyshell#25>", line 1, in <module>
consonants=t[1:4]+t[5:8]+t[9:14]+t[15+20]
IndexError: string index out of range
>>> consonants=t[1:4]+t[5:8]+t[9:14]+t[15:20]+t[21:]
>>> consonants
'BCDFGHJKLMNPQRSTVWXYZ'