#include <string.h>
#include <fstream>

using namespace std;

ifstream in("text.in");
ofstream out("text.out");

int cuvinte, mamaliga, litere;
char meh;

int main()
{
    while(in.get(meh))
    {
        if((meh >= 'a' && meh <= 'z') || (meh >= 'A' && meh <= 'Z'))
        {
            ++litere;
            ++mamaliga;
            if(litere == 1)
            {
                ++cuvinte;
            }
        }
        else
            litere = 0;
    }
    out << litere / cuvinte << "\n";

    return 0;
}