#include <iostream>

bool isHydroxide(char compound[])
{
    char char1;
    char char2;
    for (int i = 1; compound[i] != 0; i++)
    {
        char1 = compound[i - 1];
        char2 = compound[i];
    }
    return (char1 == 'O' && char2 == 'H');
}

int main()
{
    char compound[81];
    std::cout << "Introduza o composto.";
    std::cin >> compound;
    if (isHydroxide(compound))
        std::cout << "fixe";
    else
        std::cout << "notfixe";
}