Largest of 3 numbers using nested if else in Python

PROGRAM:

a=int(input("Enter A:"))
b=int(input("Enter B:"))
c=int(input("Enter C:"))

if a>b:
    if a>c:
        g=a
    else:
        g=c
else:
    if b>c:
        g=b
    else:
        g=c


print("Greater Number is=",g,end="")


#Extra Code just 4 Extra logic

if(id(g)==id(a)):
print("-->(A)")
elif(id(g)==id(b)):
print("-->(B)")
else:
print("-->(C)")

Expected O/P:

Enter A:40

Enter B:65

Enter C:89

Greater Number is= 89-->(C)