题解

#include <iostream>
#include <string>
using namespace std;

int main() {
    string word;
    cin >> word;

    int len = word.length();

    if (len >= 2) {
        if (word.substr(len - 2) == "er" || word.substr(len - 2) == "ly") {
            word = word.substr(0, len - 2);
        } else if (len >= 3 && word.substr(len - 3) == "ing") {
            word = word.substr(0, len - 3);
        }
    }

    cout << word << endl;
    return 0;
}