#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    char s[100];
    char *t;
    int n,k=0;
    f.get(s,255);
    t=strtok(s," -,.!?");
    while(t)
    {
        k++;
        n=n+strlen(t);
        t=strtok(NULL," -,!?.");
    }
    g<<n/k;
    return 0;
}