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- using System;
- using System.Linq;
- namespace ConsoleTest
- {
- public class Program
- {
- public static void Main()
- {
- string s = Console.ReadLine();
- var a = s.ToCharArray().Where(x => x == '7' || x == '4').ToArray().Length.ToString().ToCharArray();
- Console.WriteLine(a.Where(x => x != '7' && x != '4').ToArray().Length == a.Length ? "NO" : "YES");
- }
- }
- }
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