Welcome to the Python screen.
The question is on your right: First Non-Repeating Character. Read through the requirements first.
Run and submit your code as often as you need. You also have five interviewer messages this session - want to talk through your approach, or are you ready to start coding?
Given a string s, return the index of the first character that appears exactly once. If no such character exists, return -1.
1 <= len(s) <= 10^5s contains lowercase English letters-1 if there is no answer