#include<iostream>
#include<cmath>
#include<string>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");


bool litera(char c)
{
    return (c>='a')&&(c<='z')||(c>='A')&&(c<='Z');
}
void text(string s,int &x, int &y)
{
    for (int i=0; i<s.size(); i++)
    {
        if (litera(s[i])) x++;
        if (litera(s[i])&&!litera(s[i+1])) y++;
    }
}
main()
{
    int x=0,y=0;
    string s,s1;
    while (!f.eof())
    {
        getline(f,s);
        s1+=s+' ';
    }
    text(s1,x,y);
    g<<x/y;
}