import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    int ans = 0;
    for(int i = 33; i > 0; i--) {
      String regex = "";
      for(int j = 0; j < 3 * i; j++) {
        regex += "\\.";
      }
      Pattern p = Pattern.compile(regex);
      Matcher m = p.matcher(S);
      if(m.find()) {
        ans = i;
        break;
      }
    }
    System.out.println(ans);
  }
}