import java.util.Scanner;

public class Main {
    Scanner sc = new Scanner(System.in);
    String InputChar = "";
    int Count = 0;
    int Result = 0;
    public static void main(String[] args) {
        new Main().solve();
    }

    void solve() {
        for(int i = 0; i < 2; i++) {
            InputChar = InputChar + sc.next();
        }
        for(int i = 0; i < 14; i++) {
            if(InputChar.charAt(i) == 'o') {
                Count++;
            } else {
                Result = Math.max(Result, Count);
                Count = 0;
            }
        }
        Result = Math.max(Result, Count);
        System.out.println(Result);
    }
}