#include <iostream>
#include <fstream>
#include <string>
#include <ctype.h>
using namespace std;

string s;
unsigned long long lit=0,cuv=0,i=0;
int p=0;
int main()
{
    ifstream in("text.in");
    ofstream out("text.out");
    getline(in,s);

    while(i<s.size()){
        if(isalpha(s[i])) lit++;
        else {
            cuv++;
            while(!isalpha(s[i])&&i<s.size()) i++;
            i--;

        }
        i++;

    }
    cuv--;
    out<<lit/cuv;

    return 0;
}