Python problema simpla

Python: Why didn’t b and c change them values during the code(i’m begginer)?

a=input()
b=int()
c=int()
if a == 11:
b=-67
c=43
if a == 12:
b=-67
c=-23
if a == 13:
b=-67
c=-89
if a == 21:
b=-1
c=43
if a == 22:
b=-1
c=-23
if a == 23:
b=-1
c=-89
if a == 31:
b=65,
c=43
if a == 32:
b=65
c=-23
if a == 33:
b=65
c=-89
print(b,c)