#include<iostream>
#include<fstream>
#include<cstring>
using namespace std;
int main(){
ifstream in("text.in");
ofstream out("text.out");
char a[200];
char *p;
int val=0,nr=0,i;
in.getline(a,200);
char b[]=" ,.-+-?!";
for(i=0;i<=strlen(a);i++){
if(!strchr(b,a[i]))
nr++;
}
p = strtok (a,b);
  while (p )
  {
    val++;
    p = strtok (NULL,b );
    
  }
out<<nr/val;

return 0;
}