#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int nrcarac,nrcuv,n;
string s,t;
int main()
{
getline(f,s);
n=s.size();
for (int i=0;i<=n;++i)
{t="";
    while (i<=n && isalpha(s[i])) {
            nrcarac++;
            t=t+s[i];
            ++i;
    }
    if (t!="") nrcuv++;

}
g<<nrcarac/nrcuv;

}