#include<fstream>
#include<iostream>
#include<string.h>
 using namespace std;
 ifstream f("o.in");
 ofstream g("o.out");
 int k=0,nr=0;
 char *p,a[256]="",b[11]=" -:.;',?!	";
 int main()
{
 f.getline(a,256);
 while(a[0]=='-'||a[0]=='"'||a[0]==' ')
	 strcpy(a,a+1);
 p=strtok(a,b);
 while(p)
	 {
	  nr+=strlen(p);
	  k++;
	  p=strtok(NULL,b);
	 }
 if(k)
	g<<(int)nr/k;
 f.close();
 g.close();
 return 0;
}