#include<string>
#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int permu[101];
int main()
{
    freopen ("joke.in","r",stdin);
    freopen ("joke.out","w",stdout);
    string perm;
    cin >> perm;
    int len = perm.length();
    int n = len > 9 ?(perm.length()+9)/2 : len;
    int pos;
    for(int i = n ; i >0 ; i--)
    {
        string temp = to_string(i);
        pos = perm.find(temp);
        if(i > 9)perm.replace(pos,2,"dd");
        permu[pos] = i;
    }
    for(int i = 0 ; i < 101 ; i++)
    {
        if(permu[i] == 0)continue;
        cout << permu[i] << " ";
    }
    cout << endl;
}