Python Error

Question

I write

B=25
C=b+25

They show a error plz help me

Answer 1

In python b and B are different variables as it is case sensitive.
https://www.sololearn.com/learn/Python/2428/

Answer 2

I check it and find the error, thanks you all
The error is that the string not add in integer, b is string and 25 is integer so the write code
B=25
C= int(b) + 25

Answer 3

In lower case it show error