#include<stdio.h>
#include<string.h>
FILE *fin, *fout;
main()
{
fin = fopen("text.in","r");
fout = fopen("text.out","w");
char s[255];
long l,nr,n,f,i;
nr=1;
l=0;
fgets(s,255,fin);
n=strlen(s);
for(i=0;i<n;i++)
	{
	if(s[i]>='a' && s[i]<='z' || s[i]>='A' && s[i]<='Z')
		l++;
	if(s[i]!=' ' && s[i-1]==' ')
		nr++;
	}
f=l/nr;
fprintf(fout,"%d",f);
}