life is short, you need stream
import java.util.*;
import java.util.stream.*;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
Stream.of(in.nextLine().split("")).sorted().map(System.out::printf);
}
}
import java.util.*;
import java.util.stream.*;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int[] count = new int['z' - '0' + 1];
for (char c : in.nextLine().toCharArray()) {
count[c - '0']++;
}
for (int i = 0; i < count.length; i++) {
while (count[i]-- > 0){
System.out.print((char)(i + '0'));
}
}
}
}

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