#include<stdio.h> 

 
int main() 
{ 
    
FILE *in=fopen("text.in","r"), *out=fopen("text.out","w");  
char a; 
long c=0,l=0;     
do  
{         
	fscanf(in,"%c",&a);         
	if(a>=46&&a<=122) c++;        
	if(!(a>=46&&a<=122)&&c!=0) l++;   
	}while(!feof(in));       
	fprintf(out,"%d ",c/l);    
fclose(out);  
return 0;    
}
/*a==' '||a==45&&c!=0*/