#include<bits/stdc++.h>

using namespace std;

int words, letters;

char c, lastChar;

int main()
{
    freopen("text.in", "r", stdin);
    freopen("text.out", "w", stdout);

    while(c != EOF)
    {
        c = getchar();

        if(isalpha(c)) letters++;

        else if(isalpha(lastChar)) words++;

        lastChar = c;
    }

    cout << letters / words;

    return 0;
}