#include<cstdio>

using namespace std;

//ifstream in("text.in");
//ofstream out("text.out");
char s,s1=' ';

int main()
{
	long l=0,cuv=0;
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	while(scanf("%c",&s) != EOF)
	{	
		if((s<='z'&&s>='a')||(s>='A'&&s<='Z'))
		{
			l++;
			if(!((s1<='z'&&s1>='a')||(s1>='A'&&s1<='Z')))
				cuv++;
		}
		s1 = s;
	}
	//out<<l/cuv<<'\n';
	printf("%ld\n",l/cuv);
	return 0;
}