#include <iostream>
#include <fstream>

using namespace std;


char c;


int main()
{ int l=0, cuv=0, k=0;
    ifstream f ("text.in");
    ofstream g ("text.out");
    while(f.get(c)){
      if((c>='A'&&c<='Z')||(c>='a'&&c<='z')){
        l++;
        k=1;
      }
      else if(k){
        k=0;
        cuv++;
      }
    }

    if(k)cuv++;
    g<<l/cuv;

    return 0;
}