交错01串

import java.util.Scanner;

public class Main3 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		char [] s = str.toCharArray();
		int count = 0; int i = 0;int falg = 0;
		int temp = 0;
		if(s.length == 1) {
			System.out.println(1);
		}
		else {
		while(i < s.length-1) {
			if(s[i+1] != s[i]) 
				count++;
			else {
				falg = count;
				count = 0;
			}
			if(temp < falg)
				temp = falg;
			if(count == s.length-1) {
				temp = count;
			}
			i++;
		}
		System.out.println(temp+1);
		}
	
	}
}