#include<cstdio>
#include<cstring>
char s[10000000];
long i,l,lung,nr;
int main(){
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	fgets(s,10000000,stdin);
	for(i=0;i<=(long)strlen(s);i++)
		if((s[i]>='a' && s[i]<='z')||(s[i]>='A' && s[i]<='Z')){
			lung++;
			if(l==0)nr++;
			l++;
		}
		else
			l=0;
	if(l>0){
		lung+=l;
		nr++;
	}
	printf("%ld\n",(long)(lung/nr));
	fclose(stdin);
	fclose(stdout);
	return 0;
}