#include<fstream>
#include<iostream>
using namespace std;

int main()
{
	ofstream g("text.out");
	FILE * f;
    f = fopen ("text.in","r");
	int cuv=1,litere=1,medie;
	char caracter;
	while( fscanf(f,"%c",&caracter)!=EOF)
	{
		if(caracter==' ' ||caracter=='-' )
		{
			cuv++;	
				
		}
		else if((caracter<='z'&&caracter>='a')||(caracter<='Z'&&caracter>='Z'))
			{				
				litere++;				
		    }
	}
	medie=litere/cuv;	
	g<<medie;	
	return 0 ;
	
}