#include<fstream>
using namespace std;
ofstream out("text.out");
int nrcuv,nrlit;

int main()
{
	ifstream in("text.in");
	char cuv;
		bool word=false;
			while(in.get(cuv))
			{
				if((cuv>='a'&&cuv<='z')||(cuv>='A'&&cuv<='Z'))
				{
					++nrlit;
					word=true;
				}
				else
					if(word)
					{
						++nrcuv;
						word=false;
					}
			}
				if(word)
					++nrcuv;
				
			out<<nrlit/nrcuv;
			return 0;
}