#include <iostream>
#include <fstream>
using namespace std;

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

int sum,k,p;
char c;

int main()
{
    while(f.get(c))
    {

       {
           if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
                k++;
            else
            {
                if(k!=0)
                sum++;
                p=p+k;
                k=0;
            }
       }
    }
    g<<(int)p/sum;
    return 0;
}