#include <iostream>
#include <stdio.h>
#include <algorithm>
#include <math.h>
#include <string>
#include <string.h>
#include <vector>
using namespace std;
//1054
char ch[201];
bool cmp(char a,char b){
return a<b;
}
vector<char>c;
int main(){
while(scanf("%s",ch)!=EOF){
c.clear();
for(int i=0;i<strlen(ch);i++){
c.push_back(ch[i]);
}
sort(c.begin(),c.end(),cmp);
for(int i=0;i<c.size();i++)
printf("%c",c[i]);
printf("\n");
}
return 0;
}
/**************************************************************
Problem: 1054
User: cust123
Language: C++
Result: Accepted
Time:0 ms
Memory:1520 kb
****************************************************************/
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