#include <fstream>
#include <cstring>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
const int N = 1100000;
char v[N];
int main ()
{
    int x,i, nrcuv=0, nrcar=0;
    in.getline(v,N);
    for(i=0; v[i]; i++)
    {
        if(v[i]==' '|| (v[i]=='-' && v[i+1]!=' ')) nrcuv++;
    }
    for(i=0 ; v[i]; i++)
    {
        if(('a'<=v[i] && v[i]<='z') || ('A'<=v[i] && v[i]<='Z')) nrcar++;
    }
    out<<nrcar/nrcuv;
    return 0;
}