#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;

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

int main()
{
    char c[255];
    f.getline(c,255);
    char delim[] = " ,.-123456789;:/><!@#$%ˆ&*()_+-[]{}|?§±";
    int nrl =0;
    int nrc = 0;
    char * str = strtok(c,delim);
    while(str)
    {
        nrl += strlen(str);
        nrc+=1;
        str = strtok(NULL,delim);
    }
    g << nrl/nrc;
}