#include <string.h>
#include <stdio.h>
#include <algorithm>
using namespace std;

FILE *in=fopen("text.in","r"),*out=fopen("text.out","w");

long cr=0,cuv=0;
bool inword=false;

 void _read()
 {
     char ch;

     while(!feof(in))
     {
          fscanf(in,"%c",&ch);

        if( (ch>='a' && ch<='z') || (ch>='A' && ch<='Z') )
        {
         if(!inword )
          {
            cuv++;
            inword=true;
          }
         cr++;

        }
        else
        inword=false;

    }
 }

int main()
{
_read();

fprintf(out,"%ld",cr/cuv);

return 0;
}