#include<stdio.h>
int main()
{char c;
long i,nrl;
int ok,gg,nr,okk;
freopen("text.in","r",stdin);
freopen("text.out","w",stdout);
i=0;nrl=0;nr=0;
c = fgetc(stdin);
okk=0;
while(!feof(stdin))
   {ok=0;gg=0;
    while(c>='a'&&c<='z' || c>='A'&&c<='Z'){nrl++;c = fgetc(stdin);;ok=1;}
    if(ok==1)i++;
    c = fgetc(stdin); 
    }


printf("%ld",(nrl)/i);

return 0;
}