int main()
{
	char s[400005], a[10] = { "chuanzhi" };
	cin >> s; 
	int count = 0, j = 0;
	for (int i = 0; i < strlen(s); i++)
	{
		if (s[i] == a[j])
		{
			j++;
		}
		else
		{
		    i = i - j;	
			j = 0;
		}
		if (j == strlen(a))
		{
			count++;
			j = 0;
		}
	}
	cout << count << endl;
	return 0;
}