#include #include using namespace std;

int main() { string s; cin >> s; string s1; for (int i = 0; i < s.length() - 1; i++) { s1 += char(s[i] + s[i + 1]); } s1 += char(s[s.length() - 1] + s[0]);

cout << s1 << endl;

return 0;

}