#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream fin ("");
    ofstream fout ("");
    int i=0,cnt=0,cif=0,cnt1=0,p=0;
    char a;
    while(fin.eof()==false)
    {
        cif++;
        fin.get(a);
        if(isalpha(a)==0&&p==1)
        {
            cnt++;
            p=0;
        }
        else if(isalpha(a)!=0)
        {
            cnt1++;
            p=1;
        }
    }
    fout<<cnt1/cnt;
    return 0;
}