#include <iostream>
#include <fstream>

using namespace std;

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

int l,c,lt,medie;
char caractere;

int main()
{
while(f.get(caractere)){
if((caractere>='a' && caractere<='z') || (caractere>='A' && caractere<='Z'))
l++;
else{
    if(l)
    c++;
    lt=lt+l;
    l=0;
}
}
medie=lt/c;
g<<medie;
}