View Code of Problem 50

import java.util.Scanner;

public class Main {
	public static boolean isNum(char c) {
		if(c<='9' && c>='0') {
			return true;
		}else {
			return false;
		}
	}

	public static void main(String[] args) {
		
		boolean flag = true;
		Scanner scanner = new Scanner(System.in);
		String s = scanner.nextLine();
		for (int i = 0; i < s.length(); i++) {
			if(isNum(s.charAt(i))) {
				System.out.print(s.charAt(i));
				flag = true;
				continue;
			}
			if(flag) {
				System.out.print("*");
				flag = false;
			}
		}
		

	}

}