#include <iostream>
#include <cctype>

using namespace std;

string pluralForm(string word);
string convertToLowerCase(string st);
bool isVowel(char c);
void stripWhitespace(string &s);

int main (int argc, char * const argv[]) {
	string word;
	
	cout << "\n\nNew Horizons Governors School Team B\n";
	cout << "Enter a word to find the plural of (lower case): ";
	cin >> word;
	stripWhitespace(word);
	word = convertToLowerCase(word);
	
	cout << "The plural form of " << word << " is " << pluralForm(word) << endl;
	
	
    return 0;
}

string pluralForm(string word) {
	switch (word[word.length() - 1]) {
		case 'h':
			if (word[word.length() - 2] == 'c' || word[word.length() - 2] == 's')
				return word + "es";
			else
				return word + "s";
		case 's':
			return word + "es";
		case 'y':
			if (isVowel(word[word.length() - 2]))
				return word + "s";
			else {
				word.erase(word.length() - 1, 1);
				return word + "ies";
			}
		case 'z':
			if (isVowel(word[word.length() - 2]))
				word += "z";
			return word + "es";
		default:
			return word + "s";
	}
}

string convertToLowerCase(string st) {
	for (int i = 0; i < st.length(); i++)
		st[i] = tolower(st[i]);
	return st;
}

bool isVowel(char c) {
	switch (c) {
		case 'a':
		case 'e':
		case 'i':
		case 'o':
		case 'u':
			return 1;
		default:
			return 0;
	}
}

void stripWhitespace(string &s) {
	for (int i = s.length() - 1; i >= 0; i--)
		if (s[i] == ' ')
			s.erase(i, 1);
}