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  1. import java.util.Scanner;
  2.  
  3. public class Main{
  4.     public static void main(String[] args){
  5.         Scanner sc = new Scanner(System.in);
  6.         String rs = sc.next();
  7.         int c=0;
  8.         for(int i=0;i<rs.length();i++){
  9.             if(rs.charAt(i) == '4' || rs.charAt(i) == '7'){
  10.                 c++;
  11.             }
  12.         }
  13.         System.out.println((c==4 || c==7)?"YES":"NO");
  14.     }
  15. }
Success #stdin #stdout 0.11s 54560KB
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7774
stdout
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YES
https://ideone.com/f4guQ7
language:
Java (HotSpot 12)
created:
30 days ago
visibility:
public

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