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

using namespace std;

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

char a[4000001];
long c,e,i;

int main()
{   while(fin>>a[i])
    {    if((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z')) c++;
             else  if((a[i-1]>='a'&&a[i-1]<='z')||(a[i-1]>='A'&&a[i-1]<='Z'))e++;
          i++;
    }
    if((a[strlen(a)-1]>='a'&&a[strlen(a)-1]<='z')||(a[strlen(a)-1]>='A'&&a[strlen(a)-1]<='Z')) e++;
    fout<<c/e;
    fin.close();
    fout.close();
    return 0;
}