#include <bits/stdc++.h>

using namespace std;

char s[10485760], *p;
char sep[] = " `~1234567890!{@#$%^&*()-}|:+?=><,./;[]";

long long n, k;
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");

    f.get(s, 10485760);
    p = strtok(s, sep);
    while(p) {
        n += strlen(p);
        k ++;
        p = strtok(NULL, sep);
    }
    g << n / k << "\n";
    return 0;
}