Write a Python program to find the first appearance of the substring 'not' and 'poor' from a given string, if 'not' follows the 'poor', replace the whole 'not'...'poor' substring with 'good'. Return the resulting string

a = input('Enter a string ')
b=a
c=d=0
c = a.find('not')
d = a.find('poor')
print(c,d)
if(c>=0 and d>=0):
    b = b.replace(b[c:d+4],'good')
print(b)