#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;
}