#include <iostream>
#include <string>
#include <algorithm>
 
int main() {
    std::string s1 { "f9c02b6c9da8943feaea4966ba7417d65de2fe7e" };
    std::sort(begin(s1), end(s1));
    auto last = std::unique(begin(s1), end(s1));
    std::cout << std::string(begin(s1), last) << std::endl;
}