#include<iostream.h>
#include<string.h>
#include<fstream.h>
main()
{char c[100],a[100][100],sep[]=" .,!-?:;",*p;
int k,i,j,n,m,nr;
ifstream f1("text.in");
ofstream f2("text.out");
cin.get(c,100); n=strlen(c);

k=1;j=0; m=0; nr=0;
for (i=0;i<=n-1;i++)
 {p=strchr(sep,c[i]);
  if (p==NULL)
  {a[k][j]=c[i]; j++;}
   else {a[k][j]=NULL; k++; j=0;} }
a[k][j]=NULL; n=0;
for (i=1;i<=k;i++)
{n=strlen(a[i]); if (n!=0) {nr++; m=m+n;}} n=m/nr;
f2<<n;
f1.close();
f2.close();}