#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    int i,n=1,s=0,c=0;
    string prop;
    getline(f,prop);
    for(i=0;i<=prop.size()-1;i++)
        if(prop[i]>=65&&prop[i]<=90 || prop[i]>=97&&prop[i]<=122)
            {c++;
                while(prop[i]>=65&&prop[i]<=90 || prop[i]>=97&&prop[i]<=122)
                {
                    i++; s++;
                }
            }
g<<s/c;
f.close();
g.close();
    return 0;
}