dz 3.5

#include <iostream>
#include <set>
using namespace std;

int main() {
	multiset<char> str;
	int n = 30;

	char temp;
	while (n--) {
		cin >> temp;
		str.insert(temp);
	}

	for (auto& c : str)
		cout << c;
	cout << endl;

	return 0;
}