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

using namespace std;

char mystring[30000]="";

int numara()
{
    int c=0,r,cif=0;
    char *pch;
    pch=strtok(mystring," ,.!?-");
    while (pch)
    {
        c++;
        cif=cif+strlen(pch);
        pch=strtok(NULL," ,.!?-");
    }
    r=cif/c;
    return r;
}


int main()
{
    ifstream infile("text.in");
    ofstream out("text.out");
    string line;
    while (getline(infile, line))
    strcat(mystring,line.c_str());
    out<<numara();
}