#include<stdio.h>
#include<string.h>
int nr=0,l=0,media;
char txt,sep=" ,.;:?<>!";
int main()
{	FILE *f=fopen("text.in","r");
	FILE *g=fopen("text.out","w");
	fscanf(f,"%s",txt);
	strtook(txt,sep){l+=strlen(txt);
			  nr++;
			 }
	while(EOF) strtook(NULL,sep){ l+=strlen(txt);
				       nr++;
				      }
	media=l/nr;
	fprintf(g,"%D",media);
	fcloseall();
	return 0;
}