#include <bits/stdc++.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char c, ant;
int ncuv, lg;

int main()
{
    while(!f.eof())
    {
        c = f.get();
        if(f.eof()) break;
        if(isalpha(c))
            lg++;
        else if(isalpha(ant))
            ncuv++;
        ant = c;
    }
    if(isalpha(ant))
        ncuv++;
    cout << lg / ncuv;
    return 0;
}