#include<iostream>
#include<fstream>
#include<string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
int k=0,j=0,i;
char a[256];
f.get(a,256);
for(i=0;i<strlen(a);i++)
	if(a[i]!=' '&&a[i]!='!'&&a[i]!='.'&&a[i]!='-'&&a[i]!=',')
		j++;
char * pch;
pch = strtok (a," ,.-");
while (pch != NULL)
  {
    k++;
    pch = strtok (NULL, " ,.-");
  }
g<<(int)j/k;
return 0;
}