文件目录

#include <iostream>
using namespace std;
int main()
{
    string s;
    cin >> s;
    int d = s.size() - 2;
    if (s == "er" || s == "ly" || s == "ing")
        cout << s;
    else if (s.find("er", d) == d || s.find("ly", d) == d)
        cout << s.substr(0, d);
    else if (s.find("ing", d - 1) == d - 1)
        cout << s.substr(0, d - 1);
    else
        cout << s;
    return 0;
}