#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
int n,i,nrlitere=0,nrcuvinte=0,ok=0;
string s;
int main()
{
    ifstream f ("text.in");
    ofstream g ("text.out");
    getline (f,s);
    n=s.size(); s[n]=',';
    for (i=0;i<=n;i++)
    {
        if ((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
        {
            nrlitere++;
            if (ok==0) {nrcuvinte++; ok=1;}
        }
        else ok=0;
    }
    g<<nrlitere/nrcuvinte;
}