#include <fstream>
#include <iostream>
#include <cstring>

using namespace std;

ifstream fin("test.in");
ofstream fout("test.out");

int main()
{
    char s[100001];
    char* p;
    int cnt = 0, x = 0;

    cin.getline(s, sizeof(s));

    p = strtok(s, " !@#$%^&*()_+}{|:?><,./\';][=-");

    while (p != NULL)
    {
        x += strlen(p), cnt++;
        p = strtok(NULL, " !@#$%^&*()_+}{|:?><,./\';][=-");
    }
    cout << (x - 1) / cnt;
}