#include <fstream>
#include <cstring>

using namespace std;

int main()
{
    ifstream cin("text.in");
    ofstream cout("text.out");
    char a [ 200 * 200 ];
    long L = 0 , C = 0;
      cin.getline ( a , 200 * 200);
        long l = strlen(a);
         for ( long i = 0 ; i < l ; i++)
             if ( isalpha ( a[ i ])){
                 C++; L++; i++;
                 while ( isalpha (a[ i ])){
                     L++;
                     i++;}}
        cout << L / C;}