java 代码
import java.util.*;
public class Main{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
String s=sc.next();
char[] c=s.toCharArray();//转为字符
Arrays.sort(c);
for(int i=0;i<c.length;i++){
System.out.print(c[i]);
}
}
}