#include<fstream>
using namespace std;
char c1,c2;
int k,lit;
ifstream fin("text.in");
ofstream fout("text.out");
int main ()
{
    c1=-1;
    while(fin.get(c2))
    {
        if((c2>='A'&&c2<='Z')||(c2>='a'&&c2<='z'))
        {
            lit++;
        }
        if((c1>='A'&&c1<='Z')||(c1>='a'&&c1<='z'))
        {
            if(!((c2>='A'&&c2<='Z')||(c2>='a'&&c2<='z')))
            {
                k++;
            }
        }
        c1=c2;
    }
    fout<<lit/k;
    fin.close();
    fout.close();
    return 0;
}