Find the k substring index range

Problem to find the string k starting and ending index of given string.

Example-1:

Input    : s = "ilovemycrazycoding" k = "crazy"
Output   : 7 11    

Example-2:

Input    : s = "flightflowflower"   k = "fl"
Output   : 0 1  

Solution

s = "ilovemycrazycoding"

k = "crazy"

if(k not in s):

    print(-1)

else:

    a = s.index(k)

    b = a + (len(k))

    print(a,b-1)

Output

7 11