#include <iostream>
#include <string>
#include <iomanip>
#include <cmath>

using namespace std;

bool isHydroxide(string compound)
{
	if (compound.substr(compound.length() - 2) == "OH")
		return true;
	else
		return false;
}

int main()

{
	string compound;

	cout << "Insira um composto quimico: ";
	cin >> compound;

	if (isHydroxide(compound))
		cout << "E um hidroxido." << endl;
	else
		cout << "Nao e um hidroxido." << endl;

		return 0;
}