#include<fstream>
using namespace std;
char c;
bool cuvant;
int nrlit,nrcuv;
int main()
{
	cuvant=false;
	ifstream fin("text.in");
	while(fin.get(c))
	{
		if((c>64 &&c<91) || (c>96 && c<123))
		{
			nrlit++;
			if(cuvant==false)
			{
				nrcuv++;
				cuvant=true;
			}
		}
		else
			cuvant=false;
	}
	fin.close();
	ofstream fout("text.out");
	fout<<nrlit/nrcuv<<"\n";
	fout.close();
}