#include <fstream>

using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
string s;
int nrcuv,lung;
int main()
{
    int i=0,sz=s.size();
    while (fin>>s)
    {
        int i=0,sz=s.size();
        while (i<sz)
        {
            while (isalpha(s[i])==0 && i<sz)
                i++;
            if (isalpha(s[i])!=0)
                nrcuv++;
            while (isalpha(s[i])!=0 && i<sz)
            {
                lung++;
                i++;
            }
        }
    }
    fout<<lung/nrcuv;
    return 0;
}