How to access the low digits of a list

[fl]

Hi,

I have a list:






>>> lines
['12', '42', '49', '156', '225', '36', '49', '164', '11181', '3100']



I want to access the last two digits. That is:

['12', '42', '49', '56', '25', '36', '49', '64', '81', '00']


When I try to use lines[3][0] is '1'
lines[3][1] is '5'
lines[3][2] is '6'


I don't know whether there is a way to know the length of lines[3]. Then, I
can use a -1 step to get the last two digits. Or, you may have much better 
ways to do that. Python is really too versatile I feel.

Thanks,