#include <stdio.h>

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

long long nr,nrt;
char x,y;
int main()
{

 fscanf(f,"%c",&x);  nr=0; nrt=0;
 if ((x>='a' && x<='z') || (x>='A' && x<='Z')) { ++nrt; ++nr;}
 while (!feof(f)) {
     fscanf(f,"%c",&y);
     if  ((y>='a' && y<='z') || (y>='A' && y<='Z')) {
       if (!((x>='a' && x<='z') || (x>='A' && x<='Z'))) ++nr;
       ++nrt;
     }
     x=y;
 }

 fprintf(g,"%lld\n" ,(int) nrt/nr);
 return 0;
}