#include <bits/stdc++.h>

using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int lit, cuv, control ;
int main()
{
    char c;
    while(in.get(c))
    {
       if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
       {
         if(control == 0)
         {
           control = 1;
           cuv++;
         }
         lit++;
       }
       else control = 0;
    }
    out << lit / cuv;
    return 0;
}