#include<cstdio>
char s[100000];
long i,l,lung,nr;
int main(){
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	fgets(s,100000,stdin);
	for(i=0;s[i]!='\n';i++)
		if((s[i]>='a' && s[i]<='z')||(s[i]>='A' && s[i]<='Z'))
			l++;
		else if(l>0){
			lung+=l;
			nr++;
			l=0;
		}
	if(l>0){
		lung+=l;
		nr++;
	}
	printf("%ld\n",(long)(lung/nr));
	fclose(stdin);
	fclose(stdout);
	return 0;
}