Envío 2081

Código

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;

class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));

		String s = sc.nextLine();
		int count = 0, len = s.length();
		int nextborder = 1, border, i;
		int largest = 0;
		while ((nextborder = s.indexOf(s.charAt(0), nextborder)) != -1) {
			border = nextborder;
			i = 0;
			count = 0;
			while (border < len && s.charAt(i++) == s.charAt(border++)) {
				count++;
			}
			largest = Math.max(largest, count);
			nextborder++;
		}
		System.out.println(largest);

	}
}