#include <fstream>
#include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

int main()
{
    long long i, nrCuvinte=0, nrLitere=0, cuvant = 1;
    char a[10000];
    f.get(a, 10000);
    for (i=0; i<strlen(a); i++)
    {
        if (cuvant == 0) { nrCuvinte++; cuvant = 1;}
        if ((a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z'))
            nrLitere++;
        else cuvant = 0;
    }
    g<<nrLitere/nrCuvinte;
    return 0;
}