#include <iostream>
#include <string>
#include <cstring>

using namespace std;

string newUniqueStr(string str)
{
	int arr[255] = { 0 };
	for (int i = 0; i < str.size(); ++i)
		++arr[static_cast<int>(str[i])];

	string newStr = "";

	for (int i = 0; i < 255; ++i)
		if (arr[i] == 1)
			newStr += static_cast<char>(i);
	return newStr;
}