#include<fstream.h>
#include<iostream.h>
#include<math.h>
#include<string.h>

int main(){
    ifstream f("text.in");
    ofstream g("text.out");
    char c;
    long long s = 0, l = 0;
    int nr = 0;
    while (!f.eof()){
        f.get(c);
        if (isalpha(c))
            l++;
        else{
            if (l > 0){
                nr++;
                s = s + l;
                l = 0;  
            }
            //g<<s<<" "<<l<<" "<<nr<<endl;  
        }
    }
    
    s = s/nr;
    g<<s;
    return 0;
}