#include<fstream>
#include<string.h>
using namespace std;
int main()
{
int i, cuvant=0, litere=0 ;
char c, dinainte='#';
ifstream in("text.in");
ofstream out("text.out");
while(in.get(c))
{if ((c>='a' && c<='z')||(c>='A' && c<='Z'))
{ litere++;
if(dinainte<'A'||(dinainte>'Z' && dinainte<'a')||dinainte>'z' || dinainte==' ')
cuvant++;}
dinainte=c;}
out<<(litere/cuvant);
return 0;
}