#include<stdio.h>
int main()
{int k=0, p=0, x;
char c, d;
FILE *f=fopen ("text.in","r");
FILE *g=fopen ("text.out","w");
fscanf (f, "%c", &c);
d=' ';
while (!feof(f)) {if (((c>'A')&&(c<'Z'))||((c>'a')&&(c<'z'))) {k++;
							       if ((d<'A')||(d>'z')||(d==' ')) p++;
							       }
		  d=c;
		  fscanf (f, "%c", &c);
		  }
x=k/p;                  
fprintf (g, "%d", x);
fclose(f);
fclose(g);
return 0;
}