#include <fstream.h>
ifstream f("text.in");
ofstream g("text.out");
char           a[1000001],separator[]=" ;,.<>/?:;'{}[]+=-_)(*&&%^%$%#$@#!@~!`~",*p;
long long s,c;                 
int main(){                  
    f.getline (a,1000000);
    p=strtok(a,separator);
    while(p){
             s+=strlen(p);
             c++;
             p=strtok(NULL,separator);
             }
    g<<s/c;
    
    f.close();
    g.close();
    return 0;
}