Petya loves lucky numbers. We all know that lucky numbers are the positive integers whose decimal representations contain only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.

Unfortunately, not all numbers are lucky. Petya calls a number nearly lucky if the number of lucky digits in it is a lucky number. He wonders whether number n is a nearly lucky number.

Input

The only line contains an integer n (1 ≤ n ≤ 1018).

Please do not use the %lld specificator to read or write 64-bit numbers in С++. It is preferred to use the cin, cout streams or the %I64d specificator.

Output

Print on the single line "YES" if n is a nearly lucky number. Otherwise, print "NO" (without the quotes).

Examples

Input

40047


Output

NO


Input

7747774


Output

YES


Input

1000000000000000000


Output

NO

Note

In the first sample there are 3 lucky digits (first one and last two), so the answer is "NO".

In the second sample there are 7 lucky digits, 7 is lucky number, so the answer is "YES".

In the third sample there are no lucky digits, so the answer is "NO".
/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */


import java.util.Scanner;

/**
 *
 * @author mohammed
 */
public class NearlyLuckyNumber {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {

        Long  n ;
        Integer  num = 0;
        String  a;
        boolean check = false;

        Scanner sc = new Scanner(System.in);
        n = sc.nextLong();
        a = n.toString();
        
        for(int i =0 ; i< a.length() ; i++)
            if(a.charAt(i) == '4' || a.charAt(i) == '7')
                num ++ ;
        if(num ==0 )num = -1 ;
        
        if (num  == 4 || num  == 7 || num  == 47 || num == 744) {
           // System.out.println("num % 4 == 0 "+(num % 4 == 0)+" num % 7 == 0 "+(num % 7 == 0)+" num % 47 == 0 "+(num % 47 == 0));
            System.out.println("YES");
            check = true;
        }
      /*  if (!check) {
            for (int i = 1; i < a.length(); i++) {
                if (a.charAt(i) == '7' && a.charAt(i - 1) == '4') {
                    check = true;
                    System.out.println("YES");
                    break;
                }

            }
        }*/
        if (!check) {
            System.out.println("NO");
        }
       // System.out.println("num : "+num);
    }

}
