/* [A][M][C][B][N] / [K][R][I][P][6][8] */
#include <bits/stdc++.h>
#pragma warning(disable : 4996)
using namespace std;
// Global variables
const char sp = ' ', nl = '\n';
const int MOD = 777013; // 666013 998244353 1000000007
ifstream fin("text.in");
ofstream fout("text.out");

int main() {
    string str;
    getline(fin, str);
    int len(0), w(0);
    string word = "";
    for (auto x : str) {
        if (x == ' ' || x == ',' || x == '.' ||
            x == '!' || x == '?' || x == '-') {
            if (word.size())
                w++, len += word.size();
            word = "";
        }
        else word += x;
    }
    if (word.size())
        w++, len += word.size();
    fout << len / w;
}