#include<iostream>
#include<string>
#include<fstream>
using namespace std;

ifstream in("text.in");
ofstream out("text.out");
string  s,s1;


int main()
{

long long  i,sl=0,sc=2,j=1;

getline(in,s);
for (i=0;i<=s.length();++i)
{


if (((s[i]>='a')&&(s[i]<='z'))||((s[i]>='A')&&(s[i]<='Z'))) ++sl;else s[i]=' ';

}


for (i=1;i<=s.length();++i)
 {if (s[i]==' ') ++sc;
  if ((s[i]==' ')&&((s[i-1]==' ')||(s[i+1]==' '))) --sc;
 }
 int ma=sl/sc;
out<<ma;
 return 0;
 }