#include<stdio.h>
FILE *f=fopen("text.in","r"),*g=fopen("text.out","w");
int main()
{
char b[1000],a;
int j=0,i=0,ok,lm=0,cv=0;
fgets(b,32676,f);
for(;;)
{
j++;
a=b[j];
if(a=='\x0')break;
else
{
ok=0;
if(a==' ')ok=1;
if(a=='-')ok=1;
if(a==',')ok=1;
if(ok==0)i++;
if(ok==1)
{
if(i>0){lm=lm+i;cv++;i=0;}
}
}
}
fprintf(g,"%d",lm/cv);
return 0;
}