#include <iostream>
#include <fstream>
#include <string.h>

using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");

int main()
{
    string s;
    int nrCuv=0,nrLit=0;
    char c;
    while(fin>>s)
    {
        c='#';
        for (int i=0; i<s.size(); i++)
        {
            if((s[i]>='a' && s[i]<='z')||(s[i]>='A' && s[i]<='Z'))
            {
                nrLit++;
                if((c<'a' || c>'z') && (c<'A' || c>'Z'))
                {
                    nrCuv++;
                }
            }
            c=s[i];
        }
    }
    fout<<nrLit/nrCuv;

    fin.close();
    fout.close();
    return 0;
}