#include <iostream>
#include <cstring>
#include <bits/stdc++.h>

using namespace std;

void removeDuplicates(int[], int);

int main() {

    int n;

    cin >> n;

    string s = to_string(n);

    if (s.length() < 20 || s.length() > 50) {
        return 0;
    }

    char array [s.size() + 1];

    strcpy(array, s.c_str());

    int arr[s.size() + 1];
    for (int i = 0; i < s.size() +1 ; ++i) {
        arr[i] = array[i];
    }
    removeDuplicates(arr,s.length());
}

void removeDuplicates(int arr[], int n) {
    int i;

    set<int> s;
    for (i = 0; i < n; i++) {

        // insert into set
        s.insert(arr[i]);
    }

    set<int>::iterator it;

    // Print the array with duplicates removed
    cout << "\nAfter removing duplicates:\n";
    for (it = s.begin(); it != s.end(); ++it)
        cout << *it << ", ";
    cout << '\n';
}