Char error for a list and input

just a simple grade calulator i cant seem to fix. i keep getting 'char' error. heres the script.

A=14;
Am=13;
Bp=12;
B=11;
Bm=10;
Cp=9;
C=8;
Cm=7;
Dp=6;
D=5;
Dm=4;

St= input ('Sum of tests')
HWG= input ('Homework Grade')
GPG= input ('Group Project Grade')

T=.17*(St);
HW= .1*(HWG);
GP= .05*(Dm);

TOT=(T+HW+GP)

[Azzi Abdelmalek]

your code is fine. which line causes problem?

[Matt Fig]

And what are you giving as inputs?

[Walter Roberson]

Note that when you use variable names to define grade values and enter the variable name in response to input(), then the names are case-sensitive.