palin.cpp

#include <algorithm>
#include <locale>
#include <iostream>

using namespace std;

int main()
{
    int i = 0;
    string s;
    while (i++ < 4 and getline(cin, s)) {
        if (equal(s.begin(), s.begin() + s.size()/2, s.rbegin())) {
            cout << s << endl;
        }
    }
}