#include<stdio.h>
int nrlit,nrcuv;
char a,b;
void rezolvare()
{
	scanf("%c",&b);
	if ((b>='A'&&b<='Z')||(b>='a'&&b<='z'))
		++nrlit;
	while(scanf("%c",&a)!=EOF)
	{
		if ((a>='A'&&a<='Z')||(a>='a'&&a<='z'))
		{
			nrlit++;
			if (b==' '||b=='!'||b==','||b=='.'||b=='-'||b=='?'||b==':'||b==';')
				nrcuv++;
		}
		b=a;
	}
	if (nrcuv!=0&&nrlit!=0)
		printf("%d",nrlit/nrcuv);
	else
		printf("0");
	printf("\n");
}
int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	rezolvare();
	return 0;
}