/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = br.readLine();
        int max = 0;
        int cnt = 0;
        while(line!=null){
            for(String st:line.split("")){
                if(st.equals("o")){
                    cnt++;
                }else{
                    max = Math.max(max,cnt);
                    cnt = 0;
                }
            }
            line = br.readLine();
        }
        max = Math.max(max,cnt);
        System.out.println(max);
    }

}