#include<cstdio>
using namespace std;
FILE *in=fopen("text.in","r"),*out=fopen("text.out","w");
int litera(char c)
{
	if('a'<=c&&c<='z'||'A'<=c&&c<='Z') return 1;
	return 0;
}
int main()
{
	char c1=' ',c2;
	int cuv=0,ch=0;
	while(!feof(in))
	{
		fscanf(in,"%c",&c2);
		if(litera(c2))
		{
			ch++;
			if(!litera(c1)) cuv++;
		}
		c1=c2;
	}
	fprintf(out,"%d",ch/cuv);
	return 0;
}