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



public class NO203 {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));
            String S = br.readLine();
            S += br.readLine();
            int sLen = S.length();
            int count = 0;
            int max = 0;
            for (int i = 0; i < sLen; i++) {
                if(S.substring(i, i+1).equals("o")){
                    count++;
                }else{
                    max = Math.max(max, count);
                    count = 0;
                }

            }
            max = Math.max(max, count);
            System.out.println(max);
        } catch (Exception e) {
            System.err.println("Error:" + e.getMessage());
        }
    }

}