// C++ Program for counting sort 
#include <iostream>
  
using namespace std;

void countSort(string arr) 
{ 

    string output;
  
    int count[256], i; 
    for(int i=0;i<256;i++)
     count[i]=0;
  
    
    for(i = 0; arr[i]; ++i) 
        ++count[arr[i]]; 
  

    for (i = 1; i <= 256; ++i) 
        count[i] += count[i-1]; 
  
    for (i = 0; arr[i]; ++i) 
    { 
        output[count[arr[i]]-1] = arr[i]; 
        --count[arr[i]]; 
    } 

    for (i = 0; arr[i]; ++i) 
        arr[i] = output[i]; 
       
    cout<<"Sorted character array is "<<arr; 
} 
  
 
int main() 
{ 
    string arr;
    cin>>arr;
    
    countSort(arr); 
  
    return 0; 
}