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

using namespace std;

FILE *f,*s;

char a,b,sep[200]="_ 1234567890,.?/!;\'-@#$%^&*(){}[]|:<>+~`\n\0\"",lit[200]="aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ",*c1,*c2,*c3;
long long int nrc,nrl;

int main()
{
	f=fopen("text.in","r");
	s=fopen("text.out","w");
	
	b=' ';
	while(!feof(f))
	{
		fscanf(f,"%c",&a);
		
		c1=strchr(sep,a);
		c2=strchr(sep,b); 
		c3=strchr(lit,a);
		
		if(c1!=NULL&&c2==NULL)
			nrc++;
			
		if(c3!=NULL)
			nrl++;	
		
		b=a;
	}
	
	c1=strchr(lit,a);
	
	if(c1!=NULL)
	{
		nrc++;
		nrl--;	
	}
		
	if(nrc==0)
		fprintf(s,"0");
	else
		fprintf(s,"%lld",nrl/nrc);
	
	fclose(s);
	
	return 0;
}