#include<iostream>
#include<string>
using namespace std;

int main()
{
    string str;
    //int a[10] = {0};
    while(getline(cin, str))
    {
        int a[10] = {0};
        for(int i=str.size()-1; i>=0; i--)
        {
            if(a[str[i] - '0'] == 0)
            {
                cout
 
 << str[i];
                a[str[i]-'0'] ++;
            }
        }
    }
}