#include <algorithm> #include <vector> #include <cfloat> #include <string> #include <cmath> #include <set> #include <cstdlib> #include <map> #include <ctime> #include <iomanip> #include <functional> #include <deque> #include <iostream> #include <cstring> #include <queue> #include <cstdio> #include <stack> #include <climits> #include <sys/time.h> #include <cctype> using namespace std; typedef long long ll; int main() { char s[100001]; scanf("%s", s); sort(s, s+strlen(s)); reverse(s, s+strlen(s)); printf("%s\n", s); }