#include <bits/stdc++.h>

using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");

char c1, c2;
int cnt_let, cnt_wrd;

int main()
{
    while(fin.get(c1))
    {
        if(isalpha(c1))
            cnt_let++;
        else if(isalpha(c2))
            cnt_wrd++;
        c2=c1;
    }
    if(isalpha(c2))
        cnt_wrd++;
    fout << cnt_let/cnt_wrd;
    return 0;
}