#include <fstream>
#include <algorithm>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");

int main()
{
    char c;
    int cuvinte = 0,lungime = 0;
    while(cin.get(c)){
        if((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')){
            cuvinte++;
            lungime++;
            while((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
            {
                lungime++;
                cin.get(c);
            }
        }
    }
    cout << lungime/cuvinte;
    return 0;
}