#include<cstdio>

int cuv,cr,ok;

char c;

void verificare()
{
	if ( ( c>='A' && c<= 'Z')  || (c>='a' && c<= 'z') )
	{
		ok=0;
		cr++;
		return ;
	}
	
	if (!ok)
	{
		cuv++;
		ok=1;
		return ;
	}
	return ;
}

int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	
	ok=1;
	
	while(scanf("%c", &c) !=EOF)
	{
		verificare();	
	}
	
	if (ok==0) cuv++;
	
	printf("%d", cr/cuv);
	
	return 0;
}