python/TangDou/XiTi/1100.cpp

#include <bits/stdc++.h>

using namespace std;

bool has_suffix(const string &str, const string &suffix) {
    return str.size() >= suffix.size() &&
           str.compare(str.size() - suffix.size(), suffix.size(), suffix) == 0;
}

int main() {
    string s;
    cin >> s;
    string replaceStr[3] = {"er", "ly", "ing"};
    bool found = false;
    for (int i = 0; i < 3; i++) {
        if (has_suffix(s, replaceStr[i])) {
            cout << s.substr(0, s.length() - replaceStr[i].length()) << endl;
            found = true;
            break;
        }
    }
    if (!found) {
        cout << s << endl;
    }
    return 0;
}