题解 | #表示数字#

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String originalStr = scan.nextLine();
        char[] chrs = originalStr.toCharArray();
        StringBuffer sb = new StringBuffer("");
        int sign = 0;
        int start = 0;
        for (int i = 0; i < chrs.length; i++) {
            char currentChr = chrs[i];
            if (currentChr >= '0' && currentChr <= '9') {
                if (sign == 0) {
                    sign = 1;
                    start = i;
                }
            } else {
                if (sign == 1) {
                    sign = 0;
                    sb.append("*");
                    sb.append(originalStr.substring(start, i));
                    sb.append("*");
                }
                sb.append(currentChr);
            }
        }
        if (sign == 1) {
            sb.append("*");
            sb.append(originalStr.substring(start));
            sb.append("*");
        }
        System.out.println(sb);
    }
}