Find Substring

Easy Strings

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Problem Statement

Write a Python program to find the starting index of a substring within a main string. Print -1 if not found.

Input Format

Line 1: Main string. Line 2: Substring to locate.

Output Format

Print the starting index integer or -1.

Constraints

Valid inputs

Sample Input

hello world
world

Sample Output

Explanation

Use the string `.find()` method.

Starter Code

def find_substring(main_str, sub_str):
    # Write your code here
    pass

main_str = input()
sub_str = input()
print(find_substring(main_str, sub_str))

Limits

Time Limit: 1s
Memory Limit: 256MB

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