#include<cstdio>
#include<cstring>
int n,i,j,k,x;
char v[10000000000];
int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	gets(v);
	n=strlen(v);
	for (i=0;i<n-1;++i) 
		if ((v[i]==' ')||(v[i]=='-'))
		{
			if (((v[i+1]>='a')&&(v[i+1]<='z'))||((v[i+1]>='A')&&(v[i+1]<='Z')))
				k++;
		}
	else {
		if (((v[i]>='a')&&(v[i]<='z'))||((v[i]>='A')&&(v[i]<='Z'))) x++;
	}
	printf("%d",x/k);
	return	0;
}