#include<fstream.h>
#include<stdio.h>
char c;
long nrc,l;

void citire()
{
	int ok=0;
	FILE *fin;
  fin=fopen("text.in","r");
	while(!feof(fin))
		{
		 fscanf(fin,"%c",&c);
		 if(c>=65&&c<=90 || c>=97&&c<=122)
			 {
				if(!ok)
					{nrc++; ok=1;}
				l++;
			 }
			else ok=0;
		}
}


void afisare()
{
	ofstream fout("text.out");
	fout<<l/nrc;
	fout<<'\n';
	fout.close();
}


int main()
{
	citire();
	afisare();
	return 0;
}