#include <cstdio>
#include <cstring>

using namespace std;

int contor;
//daca inainte a fost litera => contor = 1;
//daca nu a fost litera => contor = 0;
int cuvinte;
int litere;
int raport;

int main()
{
    freopen("text.in", "r", stdin);
    freopen("text.out", "w", stdout);
    char c;
    while(!feof(stdin))
    {
        scanf("%c", &c);
        if((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
        {
            litere++;
            if(!contor)
            {
                cuvinte++;
                contor = 1;
            }
        }
        else
        {
            contor = 0;
        }
    }
    raport = litere / cuvinte;
    printf("%d", raport);
    return 0;
}