#include <iostream>
#include<fstream>
#include<cstdio>
using namespace std;

int main()
{ char c;
int ch=0,cuv=0;
FILE *in,*out;
in = fopen("text.in","r");
    do {
      c = getc (in);

      if((c>='a'&&c<='z')||(c>='A'&&c<='Z')) {
        cuv++;
        while((c>='a'&&c<='z')||(c>='A'&&c<='Z')) {
            ch++;
            c = getc (in);
        }
      }

    } while (c != EOF);
fclose(in);
out = fopen("text.out","w");
fprintf(out,"%d",ch/cuv);
fclose(out);
    return 0;
}