[백준] 2902번 KMP는 왜 KMP일까?

https://www.acmicpc.net/problem/2902

2902번: KMP는 왜 KMP일까?

import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		
		for (int i = 0; i < s.split("-").length; i++) {
			String ss = s.split("-")[i];
			System.out.print(ss.charAt(0));
			}
		
	}
}