#include <iostream>
#include <cstdio>
#include <string.h>
#include <fstream>
using namespace std;
int main() 
{

    freopen("text.in","r+", stdin);
    freopen("text.out", "w", stdout);
	
	char ch;
	int nr_cuv=0;
	int suma_cif=0;
	int ok=0;
 
	ch=getchar();
    while(ch!=EOF)
    {
        if((ch>='a'&& ch<='z' )||(ch>='A' && ch<='Z'))
            {
                suma_cif++;
                ok=1;
            }
		else if(ok==1)
        {
            ok=0;
            nr_cuv++;
        }
		ch=getchar();
    }
   if(ok==1)
	   nr_cuv++;
   cout<<suma_cif/nr_cuv;
 
    return 0;
}