#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
 ifstream in("text.in");
 ofstream out("text.out");
char s[100000000000];

int main()
{
in.getline(s,100000000000);
 bool ok = false;
int cuvinte=0, caractere=0;
 int lg = strlen(s);
for ( int i = 0 ; i <lg; ++ i )
{
    if(s[i]>='a'&&s[i]<='z' || s[i]>='A'&&s[i]<='Z')
        // e o litera
          {++ caractere;
              if (ok == false ) {ok = true;
                                    ++cuvinte;
                                 }
          }
       else {
        ok = false;
       }
}

out << caractere/cuvinte;



    return 0;
}