#include <bits/stdc++.h>

using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    char s;
    int nr=0,nrc=0,k;
    while(f>>s);
    {
        if(isalpha(s))
          nrc++;
        while(isalpha(s)&&!EOF)
        {
            nr++;
            f>>s;
        }
    }
    f.close();
    g<<nr/nrc;
    g.close();
    return 0;
}