Takahashi is competing in a sumo tournament. The tournament lasts for 15 days, during which he performs in one match per day. If he wins 8 or more matches, he can also participate in the next tournament.

The matches for the first k days have finished. You are given the results of Takahashi's matches as a string S consisting of `o` and `x`. If the i-th character in S is `o`, it means that Takahashi won the match on the i-th day; if that character is `x`, it means that Takahashi lost the match on the i-th day.

Print `YES` if there is a possibility that Takahashi can participate in the next tournament, and print `NO` if there is no such possibility.

Constraints

* 1 \leq k \leq 15
* S is a string of length k consisting of `o` and `x`.

Input

Input is given from Standard Input in the following format:


S


Output

Print `YES` if there is a possibility that Takahashi can participate in the next tournament, and print `NO` otherwise.

Examples

Input

oxoxoxoxoxoxox


Output

YES


Input

xxxxxxxx


Output

NO

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class Main {

	static Scanner scanner;
	public static void main(String[] args) {
	    scanner = new Scanner(System.in);

	    String S=gs();
	    int a=S.length() - S.replace("x", "").length();
	    if(a<8) {
	    	System.out.println("YES");
	    }else {
	    	System.out.println("NO");
	    }
	}

	public static double f(double r, double n, double m, double i) {
		double a = 0;
		double b=0;
		if(0<i&&i<n) {
			a=Math.abs(r-((2*r/n)*i));
			a= Math.sqrt(Math.pow(r, 2) - Math.pow(a, 2));
		}
		if(0<i-m&&i-m<n) {
			b=Math.abs(r-(2*r*(i-m)/n));
			b=Math.sqrt(Math.pow(r, 2) - Math.pow(b, 2));
		}
		return 2* Math.max(a, b);
	}
	// 文字列として入力を取得
	public static String gs() {
		return scanner.next();
	}

	// intとして入力を取得
	public static int gi() {
		return Integer.parseInt(scanner.next());
	}

	// longとして入力を取得
	public static long gl() {
		return Long.parseLong(scanner.next());
	}

	// doubleとして入力を取得
	public static double gd() {
		return Double.parseDouble(scanner.next());
	}
}