abc179_a - Plural Form

using namespace std;
using ll = long long;
using ii = pair<int, int>;
using vi = vector<int>;
int main(void)
{
    string s;
    cin >> s;
    if (s.back() == 's')
        cout << s << "es" << endl;
    else
        cout << s << "s" << endl;
    return 0;
}