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".
import java.util.*;
public class HelloWorld{

     public static void main(String []args){

      Scanner sc=new Scanner(System.in);
      long n=sc.nextLong();
      long temp=n,cnt=0;
      while(temp>0)
      {
          long r=temp%10;
          if(r==7 || r==4)
           cnt++;
          temp/=10;
      }
     // System.out.println(cnt);
      if(cnt==0)
      {
          System.out.println("NO");
          return;
      }
      while(cnt>0)
      {
          long r=cnt%10;
          if(r!=7 && r!=4)
            {
                System.out.println("NO");
                return;
            }
          cnt/=10;
      }
      
      System.out.println("YES");
      
     }
}