#include<stdio.h>
#include<string.h>
long long n;
char v[1000010];

void read()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	gets(v);
	n=strlen(v);
	v[n]=' ';
	v[n+1]=NULL;
}

void rez()
{
	long long i;
	long long nr=0;
	long long l=0;
	for(i=0;i<=n;i++)
		if((v[i]>='a' && v[i]<='z') || (v[i]>='A' && v[i]<='Z'))
			l++;
		else
			if((v[i-1]>='a' && v[i-1]<='z') || (v[i-1]>='A' && v[i-1]<='Z'))
				nr++;
	if(nr==0)
	{
		printf("0\n");
		return;
	}
	printf("%lld",l/nr);
}

int main()
{
	read();
	rez();
	return 0;
}