#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
  int lit=0,nrcuv=0;
  char c;
  FILE*fin,*fout;
  fin=fopen("text.in","r");
  c=fgetc(fin);
  while(c!=EOF){
    if((c>='a' && c<='z') || (c>='A' && c<='Z')){
      nrcuv++;
      while(c!=EOF && ((c>='a' && c<='z') || (c>='A' && c<='Z'))){
        lit++;
        c=fgetc(fin);
      }
    }
    else
      c=fgetc(fin);
  }
  fclose(fin);
  fout=fopen("text.out","w");
  fprintf(fout,"%d",lit/nrcuv);
  fclose(fout);
  return 0;
}