#include <stdio.h>
#include <string.h>

#define Dim 1024

char sir[Dim];

int main()
{
	int A,B,cuv,N,i;

	freopen("text.in","r",stdin);

	A=0;
	B=0;
	cuv=0;

	while(!feof(stdin))
	{
		fgets(sir,Dim,stdin);
		if(!feof(stdin))
		{
			N=strlen(sir)-1;
			for(i=0;i<=N;i++)
				if(('A'<=sir[i]&&sir[i]<='Z')||('a'<=sir[i]&&sir[i]<='z'))
				{
					A++;
					cuv=1;
				}
				else
				{
					if(cuv) B++;
					cuv=0;
				}
		}
	}

	freopen("text.out","w",stdout);

	printf("%d\n",A/B);

	return 0;
}