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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.         int A = sc.nextInt();
  7.         int B = sc.nextInt();
  8.         boolean found = false;
  9.  
  10.         for (int i = A; i <= B; i++) {
  11.             int x = i;
  12.             boolean isLucky = true;
  13.  
  14.             while (x > 0) {
  15.                 int digit = x % 10;
  16.                 if (digit != 4 && digit != 7) {
  17.                     isLucky = false;
  18.                     break;
  19.                 }
  20.                 x /= 10;
  21.             }
  22.  
  23.             if (isLucky) {
  24.                 if (found) System.out.print(" ");
  25.                 System.out.print(i);
  26.                 found = true;
  27.             }
  28.         }
  29.  
  30.         if (!found) {
  31.             System.out.println(-1);
  32.         }
  33.         sc.close();
  34.     }
  35. }
  36.  
Success #stdin #stdout 0.18s 56584KB
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https://ideone.com/flf0FH
language:
Java (HotSpot 12)
created:
3 days ago
visibility:
public

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