#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[1<<20];
int64_t nr_cuvinte, litere;
bool litera(char), cuvant = false;
int main()
{
    f.getline(s, sizeof(s));
    for(unsigned int i = 0; i < strlen(s); i++)
        if(litera(s[i]))
        {
            if(!cuvant)
                nr_cuvinte++;
            litere++;
            cuvant = true;
        }
        else
            cuvant = false;
    g << litere / nr_cuvinte;
    return 0;
}
bool litera(char c)
{
    return (c >= 'a' && c <= 'z')||(c >= 'A' && c <= 'Z');
}