#include<string>
#include<stdio.h>
#include<conio.h>
int main()
{
	char s[100],*p,separator[]=" ,-!",v[100][100];
	int x=0,k=0;
	FILE *f1=fopen("text.in","r"),*f2=fopen("text.out","w");
	fgets(s,100,f1);
    p=strtok(s,separator);
	while(p)
	{
		x=x+strlen(p);
		k++;
		p=strtok(NULL,separator);
	}
	fprintf(f2,"%d",x/k);
	getch();
	return 0;
}