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

using namespace std;

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

int main()
{
    char str[999999];
    char *p;

    int nr_cuv=0,nr_chr=0;

    fin.getline (str,999999);

    p = strtok (str," ,.-,1,2,3,4,5,6,7,8,9,0,!,?,=");
  while (p != NULL)
  {
   // fout<<p<<" "<<strlen(p)<<endl;
    nr_cuv++;
    nr_chr=nr_chr+strlen(p);
    p = strtok (NULL, " ,.-,1,2,3,4,5,6,7,8,9,0,!,?,=");
  }
    fout<<nr_chr/nr_cuv;

    return 0;
}