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#include <bits/stdc++.h>
using namespace std;

vector<int> convert (string s){
    vector<int>a;
    for (int i=0; i<s.size(); i++){
        if (i%2==0)
        a.push_back(s[i]-'0');
    }
    return a;
}

int main() {
	//int t;
	//cin>>t;
	//while(t--){
        string s;
        getline(cin,s);
        vector<int>v = convert(s);
        for (int i=0; i<v.size(); i++){
            cout<<v[i]<<" ";
        }
	//}
	return 0;
}