#include <stdio.h>
#include <stdlib.h>
#include <string.h>


int main()
{
FILE * f=fopen("text.in","rt"),*g=fopen("text.out","wt");
long nrcuv=0,nrlitere=0;
char c;
int C=0;

for (;;)

{
   if (fscanf(f,"%c",&c) != 1) 
          {if (C) {nrcuv++; break;}
           else break;
           }
    
    if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z')) { nrlitere++; C=1; }
    else if (C==1) { nrcuv++; C=0; }  
         
    
}

if (nrlitere!=0) fprintf(g,"%li",nrlitere/nrcuv);
else fprintf(g,"%c",0);
fclose(f); fclose(g);
return 0;
}