#include #include #include #include using namespace std;

int main() { //freopen("m.in","r",stdin); //freopen("m.out","w",stdout); string a; cin >> a; int t = a.size(); int h[t] = {}; int o = 0; for (int i = 0; i < t; i++) { if (a[i] >= '0'&&a[i] <= '9') { h[o] = a[i] - '0'; o++; } } sort(h, h + o); for (int i = o - 1; i >= 0; i--) { cout << h[i]; } return 0; }