#include <fstream>
#define DIM 1048580

using namespace std;

char s[DIM];//1 MB = 1024 * 1024 B

inline bool CheckLetter(char x)
{
	return ('a' <= x && x <= 'z') || ('A' <= x && x <= 'Z');
}

int main()
{
	ifstream fin("text.in");
	fin.getline(s, DIM);
	fin.close();
	int sum = 0, cnt;
	if (CheckLetter(s[0]))
		cnt = 1;
	else
		cnt = 0;
	for (int i = 0;s[i];++i)
	{
		if (CheckLetter(s[i]))
			++sum;
		else
		{
			++cnt;
			++i;
			while (!CheckLetter(s[i]) && s[i] != 0)
				++i;
			--i;
		}
	}
	ofstream fout("text.out");
	fout << sum / cnt << "\n";
	fout.close();
	return 0;
}