#include <iostream>
#include <string>
 
using namespace std;
 
char lowerCase(char c)
{
	return (c >= 'A' && c <= 'Z') ? (char)(c + 32) : c;
}
 
int main() {
	string str;
	cin >> str;
 
	char temp;
 
	for (int i = 0; i < str.size(); i++)
    {
        for (int j = 0; j < str.size(); j++) 
        {
            if (lowerCase(str.at(i)) > lowerCase(str.at(j)))
            {               
                temp = str.at(j);
                str.at(j) = str.at(i);
                str.at(i) = temp;
            }   
        }
    }
 
    cout << str;
 
	return 0;
}

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