#include <bits/stdc++.h>

using namespace std;

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

char s;
int medie,cate;
bool ok;

int main()
{
    while(f >> noskipws >> s)
    {
        if(isalpha(s))
        {
            ++ medie;
            if(!ok)
                ++ cate;
            ok = 1;
        }
        else
            ok = 0;
    }
    if(!cate)
        g << 0;
    else
        g << medie / cate;
}