题解 | #表示数字#我菜啊

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine().trim();
        char[]  chs=str.toCharArray();
        StringBuffer sb =new StringBuffer();
        if(Character.isDigit(chs[0])) sb.append(String.valueOf("*"));
        for(int i =0;i<chs.length-1;i++){
            if(!Character.isDigit(chs[i]) && Character.isDigit(chs[i+1])) sb.append(String.valueOf(chs[i])+"*");
            else if((!Character.isDigit(chs[i+1]))&& Character.isDigit(chs[i])) sb.append(String.valueOf(chs[i])+"*");
            else sb.append(String.valueOf(chs[i]));
        }
       
            if(Character.isDigit(chs[chs.length-1])) sb.append(String.valueOf(chs[chs.length-1])+"*");
        else sb.append(String.valueOf(chs[chs.length-1]));
        
        
        System.out.print(sb.toString());
    }
}