#include <fstream.h>
#include <string.h>
ifstream f("text.in");
ofstream g("text.out");
int main()
{char v[30000],a;
f.getline(v,30000,'\n');
int i,l,c,x;l=0;i=0;c=0;x=0;
while(v[i]!=NULL)
{a=v[i];
 if((a>='a' && a<='z') || (a>='A' && a<='Z')) {l++;x=1;}
 if((a==' ' || a=='-' || a=='\'' || a=='/') && x==1) c++;
 i++;}
 c++;
 g<<l/c;return 0;}