#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
string s;
int nrcar,nrcuv,i;
int main()
{
    getline(fin,s);
    i=0;
    while(i<s.length())
    {
        if(s[i]>='a'&&s[i]<='z' || (s[i]>='A' && s[i]<='Z'))
        {
            nrcuv++;
            do
            {
               nrcar++;
               i++;
            }
            while(i<s.length() && (s[i]>='a'&&s[i]<='z') || (s[i]>='A' && s[i]<='Z'));
        }
        else i++;
    }
    fout<<nrcar/nrcuv;
    fout.close();
    return 0;
}