#include<stdio.h>
int s=0,s1=0;
void citire()
	{
	char x;
	while(!feof(stdin))
		{
		scanf("%c",&x);
		if((int(x)>64)&&(int(x)<91)||(int(x)>96)&&(int(x)<123))s++;
		if((x==' ')||(x=='-')||(x=='!')||(x=='?')||(x=='.')){if(s)s1++;}
		}
	}

void afisare()
	{
	printf("%d\n",int(s/(s1-1)));
	}

int main()
	{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	citire();
	afisare();
	return 0;
	}