#include<fstream.h>
#include<string.h>
int main(){
char a;
unsigned int s=0,k=0,i,y=0;
ifstream f("text.in");
ofstream g("text.out");
while(!f.eof())
    {
     f>>a;
    	{
	if((a[i]>64&&a[i]<91)||(a[i]>=97&&a[i]<=122))
		{ while((a[i]>64&&a[i]<91)||(a[i]>=97&&a[i]<=122))
		       {k++;i++;f>>a;}
		  y++;s+=k;f>>a;
		}
	k=0;
	}
    }
g<<(int)s/y;
return 0;
}