#include <fstream.h>
#include <stdio.h>
#include <ctype.h>
FILE *f=fopen("text.in","r");
ofstream g("text.out");
char a;
long long s,c;                 
int main(){                  
 while(!feof(f)){
                 a=        fgetc(f);            
                      if(isalpha(a)){c++;                  
                while(isalpha(a)){s++; a=        fgetc(f);           }
                }
         //    g<<a;
}
    g<<s/c;
    fclose(f);
    g.close();
    return 0;
}