#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");ofstream fout("text.out");
int cuvinte,i,total,medie;
char text;
int main()
{
    while(fin.get(text))
    {
        if((text>='A'&&text<='Z')||(text>='a')&&(text<='z'))
        {
            total++;
            while((fin.get(text)&&text!='\0')&&((text>='A'&&text<='Z')||(text>='a'&&text<='z'))) total++;
            cuvinte++;
        }
    }
    medie=total/cuvinte;
    fout<<medie;
    return 0;
}