#include <fstream>

using namespace std;

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

int main()
{
    char x;
    char v[800];
    int nr_c=0,nr=0,k=0;
    while (fin.get(x)) {
        v[k++]=x;
    }
    for (int i=0;i<k;i++) {
        if ((v[i]>='a' && v[i]<='z') || (v[i]>='A' && v[i]<='Z')) nr++;
        else
            if ((v[i+1]>='a' && v[i+1]<='z') || (v[i+1]>='A' && v[i+1]<='Z')) nr_c++;
    }
    fout<<nr/nr_c;
}