//Bou Marian Catalin
#include<fstream.h>
#include<string.h>
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{ char c[65535];
  int n,i,cuv=0,lit=0,x=0;
  while(!fin.eof())
  { fin.getline(c,65534);
    n=strlen(c);
    for(i=0;i<n;i++)
      if((c[i]>='a'&&c[i]<='z')||(c[i]>='A'&&c[i]<='Z')){x=1; lit++;}
      else if(x){ cuv++;x=0;}
  }
n--;if((c[n]>='a'&&c[n]<='z')||(c[n]>='A'&&c[n]<='Z'))cuv++;
fout<<(int)lit/cuv;
return 0;}