q198997730

#include <iostream>
#include <string>

using namespace std;

int main()
{
    string s;
    getline(cin, s);

    string temp = "";
    for (int i = 0; i <= s.size(); i++)
    {
        if ((s[i] == ' ') || (i == s.size())) {
            if (temp.size() == 0) continue;
            if (temp[0] == temp[temp.size() - 1])
                cout << temp << endl;
            temp = "";
        } else {
            temp += s[i];
        }
    }

    return 0;
}