#include<iostream.h>
#include<fstream.h>
#include<string.h>

int litere(char c[])
{ int k=0;
 for(int i=0;i<strlen(c);i++)
		k++;
 
 return k;
}


int main()
{
	ifstream f("date.in");
	ofstream g("date.out");
	char c[2000],*p,sep[10]="!- ,.?";
	int S=0,k=0;
	while(!f.eof())
		{
			f.get(c,2000);
			f.get();
		
		p=strtok(c,sep);
		while(p)
		{
			S+=litere(p);
			k++;
			p=strtok(NULL,sep);
		
		}
		p=0;
		}
	
g<<S/k;
	
}