import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * @author 令照辉 [zeekling@163.com]
 * @version 1.0
 * @apiNote
 * @since 2020-03-01
 */
public class StrSorted {


    public static void main(String []args) throws IOException {
        BufferedReader bf=new BufferedReader(new InputStreamReader(System.in));
        String str;
        while((str=bf.readLine())!=null){
            StringBuilder builder = new StringBuilder();
            for(int i=0;i<26;i++){
                char c=(char)(i+'A');
                for(int j=0;j<str.length();j++){
                    char sc=str.charAt(j);
                    if(c==sc||c==sc-32){
                        builder.append(sc);
                    }
                }
            }
            for(int i=0;i<str.length();i++){
                char c=str.charAt(i);
                if(!(c>='a'&&c<='z')&&!(c>='A'&&c<='Z')){
                    builder.insert(i,c);
                }
            }
            System.out.println(builder.toString());
        }
        bf.close();
    }

}