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 P110A_Nearly_Lucky {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long input = sc.nextLong();
        long count = 0;
        while(input != 0) {
            long temp = input % 10;
            input = input / 10;
            if(temp == 4 || temp == 7) {
                count++;
            }
        }
        isLucky(count);
    }

    public static void isLucky(long num) {
        if(num == 0) {
            System.out.println("NO");
        }
        else {
            boolean flag = true;
            while(num != 0) {
                long temp = num % 10;
                num = num / 10;
                if(temp == 4) {
                    continue;
                }
                else if(temp == 7) {
                    continue;
                }
                else {
                    flag = false;
                    break;
                }
            }
            if(flag) {
                System.out.println("YES");
            }
            else {
                System.out.println("NO");
            }
        }

    }
}
