题解 | #表示数字#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        scanner.useDelimiter("\n");

        while (scanner.hasNext()) {
            String S = scanner.next();
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < S.length();) {
                 if (S.charAt(i)>='0' && S.charAt(i) <= '9') {
                     builder.append("*");
                     builder.append(S.charAt(i));
                     int j=i+1;
                     while (j<S.length()) {
                         if (!(S.charAt(j)>='0' && S.charAt(j) <= '9')) {
                            break;
                         }
                         builder.append(S.charAt(j));
                         j++;
                     }
                     builder.append("*");
                     i=j;
                 } else {
                     builder.append(S.charAt(i));
                     i++;
                 }
            }
            System.out.println(builder);
        }
    }
}