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- import java.util.*;
- public class Main{
- public static void main(String[] args) {
- Scanner sc = new Scanner(System.in);
- String[] s = sc.next().split("\\+");
- Arrays.sort(s);
- for(int i =0 ; i < s.length; i++) {
- if(i == (s.length-1)) {
- System.out.print(s[i]);
- } else System.out.print(s[i] + "+");
- }
- }
- }
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