#include<cstdio>
#include<cstring>
using namespace std;
char s[10001];
int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	
	int i,nrlit=0,nrcuv=0,s1=0;
	gets(s);
	for(i=1;s[i];i++)
	{
		if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
			nrlit++;
		if((s[i]>='a'&&s[i]<='z'&&s1==0)||(s[i]>='A'&&s[i]<='Z'&&s1==0))
			s1=1;
		if((s[i+1]<'a'&&s1==1)||(s[i+1]>'z'&&s1==1)||(s[i+1]<'A'&&s1==1)||(s[i+1]<'Z'&&s1==1))
		{
			nrcuv++;
			s1=0;
		}	
	}
	s1=nrlit/nrcuv;
	printf("%d",s1);
	return 0;
}