#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main() {
string st;
cin >> st;
sort(st.begin(), st.end());
cout << st << endl;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8c3RyaW5nPgojaW5jbHVkZSA8YWxnb3JpdGhtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CgkKCXN0cmluZyBzdDsKCQoJY2luID4+IHN0OwoJCglzb3J0KHN0LmJlZ2luKCksIHN0LmVuZCgpKTsKCQoJY291dCA8PCBzdCA8PCBlbmRsOwoJCglyZXR1cm4gMDsKfQ==
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
(๑>﹏<๑`)ぷ……(๑>﹏<๑`)ぷ……(๑>﹏<๑`)ぷぇぇ……(๑>﹏<๑`)ぷ……(๑>﹏<๑`)ぷぇぇぇぇええん(๑>﹏<๑`)ぷぇぇぇぇーーええええん(๑>﹏<๑`)ぷぇ……(๑>﹏<๑`)ぷぇぇええええーーええぇぇん