#include<stdio.h>
char c,c1;
int nlit,ncuv;
int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	c1=' ';
	while(scanf("%c",&c)!=EOF)
	{
		if(c>='a'&& c<='z' || c>='A' && c<='Z')nlit++;
		if((c1>='a'&& c1<='z' || c1>='A' && c1<='Z')&&(!(c>='a'&& c<='z' || c>='A' && c<='Z')))
			ncuv++;
		c1=c;
	}
	if(c1>='a'&& c1<='z' || c1>='A' && c1<='Z')ncuv++;
	printf("%d",nlit/ncuv);
	return 0;
}