#include <fstream>
#include <string.h>
using namespace std;

ifstream f("text.in");
ofstream g("text.out");
char text[100],b;
int n,nrcuv=0,nrlitere=0;

int main()
{
    char semne[]={' ',',','.','-','!','?','1','2','3','4','5','6','7','8','9','0'};
    f.get(text,99);
    n=strlen(text);
   char * pch;
  pch = strtok (text,semne);
  while (pch != NULL)
  {
    nrcuv++;
    nrlitere+=strlen(pch);
    pch = strtok (NULL,semne);
  }
  g<<nrlitere/nrcuv;
  return 0;
}