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 ex {
    public static void main(String[]args){
        Scanner in = new Scanner(System.in);
        String a = in.next();
        int [] arr = new int [a.length()];
        int count = 0;
        for(int i=0;i<a.length();i++){
        	arr[i] = a.charAt(i);
        }
        for(int i=0;i<a.length();i++){
        	if(arr[i]=='7' || arr[i]=='4'){
        		count++;
        	}
        }
        

        	if(count==4 || count==7 || count==47 || count==74 || count==474){
        		System.out.println("YES");
    		}
    		else{
    			System.out.println("NO");
    		}

    }       
}