#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

ifstream in("text.in");
ofstream out("text.out");

char c;
int cuv;
int lit;
bool v;

int main()
{
    while(in.get(c)){
        if((c >= 'a' and c <= 'z') or (c >= 'A' and c <= 'Z')){
            lit++;
            v = true;
        }else{
            if(v){
                cuv++;
                v = false;
            }
        }
    }

    out << lit/cuv;

    return 0;
}