#include<fstream>
#include<ctype.h>
using namespace std;

int main()
{
	ifstream f("text.in");
	ofstream g("text.out");
	
	
	int nrc=0,nrl=0;
	char c;
	
	while(!f.eof())
	{
		int nrv=0;
		//g<<"cuvantul nr "<<nrc<<" este: ";
		do{			
			
			f.get(c);	
			if(isalpha(c)) nrv++;//g<<c;}
			
			
			if(f.eof()) break;
		}while(isalpha(c));
		
		
		//if(!isalpha(c))
		if(nrv!=0)
			{
				nrc++;
				nrl+=nrv;
				//g<<endl;
			}		
									
	}
	
 	//g<<nrl<<" "<<nrc<<" "<<nrl/nrc;
	g<<nrl/nrc;
	return 0;
}