#include <fstream>
#include<iostream>


using namespace std;
char s[1600];

ofstream g("text.out");

void citire()
{
    ifstream f("text.in");
    f.get(s,1000);
    f.close();
}


int main()
{
    citire();
    int nr=0,leng=0;
    char *p;
    p=strtok(s," /.,';=-+_|}{][?><`!~@#$%^&*()1234567890");
    while(p)
    {
        nr++;
        leng+=strlen(p);
        p=strtok(NULL," /.,';=-+_|}{][?><`!~@#$%^&*()1234567890");
    }
    g<<leng/nr;

    return 0;
}