#include<stdio.h>
#include<string.h>
long c,l;//nr de cuvinte/nr de litere
char a[1000020],*p,sep[1000];

int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
        scanf("%s",a);
        l=0;
        for (char i=31;i<127;i++) 
           if ((i<'a' || i>'z') && (i<'A' || i>'Z'))
             sep[l++]=i;
        sep[l]=0;
        p=strtok(a,sep);
        l=0;
        while (p)
             {
             c++;
             l=l+strlen(p);
             p=strtok(p,NULL);
             }
	printf("%ld\n",l/c);
	fclose(stdin);
	fclose(stdout);
	return 0;
}