Splitting String after a specific letter in Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner input = new Scanner(System.in);
        String s = input.nextLine();
        input.close();
        int index = s.indexOf("a");
        if(index != -1){
            s = s.substring(index) ;
        }

        System.out.println(s);

    }

}