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

int main() {
	string alphabet = "abcdefghijklmnopqrstuvwxyz";
	string voyelles = "uaoie";
	string mix = "acdecdicdocducd";

	cout << alphabet.find('e') << endl;
	cout << alphabet.at(alphabet.find_first_of(voyelles)) << endl;
	cout << alphabet.at(alphabet.find_last_of(voyelles)) << endl;
	cout << alphabet.at(alphabet.find_first_not_of(voyelles)) << endl;
	cout << alphabet.at(alphabet.find_last_not_of(voyelles)) << endl;

	cout << mix.find("cd") << endl;
	cout << mix.rfind("cd") << endl;
	cout << mix.find("cd",mix.find("cd")+1) << endl;

	string s = "C'est Toto le plus fort";
	s.replace(s.find("Toto"), 4, "Xavier");
	cout << s << endl;

	string s1 = s.substr(21, 4);
	cout << s1 << endl;

	return 0;
}