#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char a[1000000];
int cv,ch,i;
bool st;
int main()
{
    while(f>>a)
    {
        i=0;
        st=1;
        while(a[i]!='\0')
        {
            if((int(a[i])>64&&int(a[i])<91)||(int(a[i])>96&&int(a[i])<123))
            {
                if(st)
                {
                    st=0;
                    ch++;
                    cv++;
                }
                else
                    ch++;
            }
            else
                st=1;
            i++;
        }
    }
    g<<ch/cv;
    return 0;
}