import pdb

def add(a):
    return a * a
pdb.set_trace()
a = input("A = ")
b = input("B = ")
c = int(a) + int(b)
print(c)
d = add(3)
print(d)

kodingwindow@kw:~$ python3 kw.py
> /home/kodingwindow/kw.py(6)<module>()
-> a = input("A = ")
(Pdb) n
A = 1
> /home/kodingwindow/kw.py(6)<module>()
-> b = input("B = ")
(Pdb) n
B = 8
> /home/kodingwindow/kw.py(6)<module>()
-> c = int(a) + int(b)
(Pdb) n
> /home/kodingwindow/kw.py(6)<module>()
-> print(c)
(Pdb) c
9
9