package me.yukicoder.lv1;

import java.util.Scanner;

public class No0203 {
	public static void main(String[] args) {
		try (Scanner sc = new Scanner(System.in)) {
			int cntHolidays = 0;
			int tmp = 0;
			String s = sc.nextLine() + sc.nextLine();
			char[] c = s.toCharArray();
			
			for (int i = 0; i < 14; i++) {
				if (c[i] == 'o') {
					tmp++;
				}
				if (cntHolidays < tmp) {
					cntHolidays = tmp;
				}
				if (c[i] == 'x') {
					tmp = 0;
				}
			}
			System.out.println(cntHolidays);
		}
	}
}