#include <iostream>
#include <fstream>
#include <string>
using namespace std;
string s;
int nr, nri, ok, k, v[1000];
int main()
{
    ifstream f ("text.in");
    ofstream g ("text.out");
    getline (f,s);
    for (int i=0;i<=s.length();i++)
    {
    if (isalpha(s[i]))
        nr++;
    else
    {
        k++;
        v[k]=i;
    }
    }
    for (int i=1;i<=k-1;i++)
        if (v[i]!=v[i+1]-1)
            nri++;
    g<<nr/nri;
    return 0;

}