#include<stdio.h>
char ch,lastch;
int nrcuv,chestie;
bool trbadaugat=1;
int main(){
	int player_unu=0;
	int nrcuv=0,chestie=0;
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	//ch=32;

	while(!feof(stdin))
	{
		scanf("%c",&ch);
		if(ch=='!'||ch==' '||ch=='.'||ch=='?'||ch==','||ch=='-')
			trbadaugat=1;
		if((ch>=97&&ch<=122)||(ch>=65&&ch<=90))
		{
		    chestie++;
			if(trbadaugat==1)
			{nrcuv++;trbadaugat=0;}
		}
	}
	printf("%d",chestie/nrcuv);

	return player_unu;
}