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