import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No203 {
	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str = br.readLine();
		String str2 = br.readLine();
		String str3 = str + str2;
		System.out.println(check(str3));
	}
	
	public static int check(String s){
		int holiday = 0;
		int maxHoliday = 0;
		char[] day = s.toCharArray();
		for(int i=0; i < 14; i++){
			if(day[i] == 'o') holiday++;
			else{ 
				if(maxHoliday < holiday){
					maxHoliday = holiday;
				}
				holiday = 0;
				}
		}
		if(maxHoliday < holiday) return holiday;
		else return maxHoliday;
	}
}