#include<stdio.h>
#include<string.h>
FILE *fin, *fout;
main()
{
fin = fopen("text.in","r");
fout = fopen("text.out","w");
char c;
long l,nr,f,i,ok;
nr=1;
l=0;
ok=0;
while(fscanf(fin,"%c",&c)!=EOF)
	{
	if(c>='a' && c<='z' || c>='A' && c<='Z' || c=='-')
		{
			if(c!='-')
			{
			l++;
			ok=1;
			}
		}
	else
		if(ok==1)
		{
		nr++;
		ok=0;
		}
	}
f=l/nr;
fprintf(fout,"%d",f);
fclose(fin);
fclose(fout);
}