#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[300],sep[]=" 1234567890!@#$%^&*()_+=-0,-.:\";!?\'";
int S,c;




int main()
{
    char *p;
    f.get(s,300);

    p=strtok(s,sep);


    while(p)
    {   S+=strlen(p);
        c++;
        p=strtok(NULL,sep);
    }

g<<S/c;
    return 0;
}