#include <string.h>
#include <unordered_set>
#include <iostream>
 
using namespace std;
 
int main() 
{
	  char arr[] = "aaa bbb,aa, bbb\ta aa    bb";
      unordered_set<string> uniqWords;
      char *token = strtok(arr, " \t,.:;\r\n!?");
      while (token != NULL)
      {
            uniqWords.insert(token);
            token = strtok(NULL, " ");
      }
 
      cout << "Unique words = " << uniqWords.size() << '\n';
 
	  return 0;
}

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