please explain thought process and use the define function given in picture

 

Needle in haystack Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Example 1: Input: haystack "sadbutsad", needle "sad" Output: 6 Explanation: "sad" occurs at index 0 and 6. The first occurrence is at index 0, so we return 0. Example 2: Input: haystack "leetcode", needle "Leeto" Output: -1 Explanation: "Leeto" did not occur in "Leetcode", so we return -1. + scaffold py 1 def solution (haystack, needle): 2 your code goes here nomerscaffold.py Spaces: 4 (Auto) All changes saved Terminal Mark Click here to activate the terminal