int endzy(const string& str)
{
    int count = 0;
    int len = str.length();
    char ch, previous, last;

    for (int i = 1; i < len; i++) // test begins from the second char
    {
        ch = str[i];
        previous = str[i - 1];
        if (ch == ' ' || ch == ':' || ch == '-' || ch == '!' || ch == '"' || isdigit(ch))
        {
            if (previous == 'y' || previous == 'Y' || previous == 'z' || previous == 'Z')
            {
            count++;
            }
        }
    }
    last = str[len - 1];

    if (last == 'y' || last == 'Y' || last == 'z' or last == 'Z')
    {
        count++;
    }

    return count;
}