diff --git a/py/ga_optimized_random_generator.py b/py/ga_optimized_random_generator.py
index a9c000e..5c28c26 100644
--- a/py/ga_optimized_random_generator.py
+++ b/py/ga_optimized_random_generator.py
@@ -31,6 +31,7 @@
             self.pool = self.mutate()
             self.pool = self.crossover_all()
             best_parent = self.__find_best_parents(1)[0]
+            print('s', self.__calc_dist_cost(best_parent, self.trials))
             print(best_parent, ' ', self.calculate_tl_ratio(best_parent, self.n))
         return best_parent
 
@@ -55,14 +56,20 @@
         sorted_pool = sorted(self.pool, key=lambda ss: self.fitness(ss))
         return sorted_pool[:count]
 
-    def __dist_fitness(self, seq, trials):
+    def __calc_dist_cost(self, seq, trials):
         """
         Calculate fitness according to the similarity to the desired uniform distribution.
-        :param seq:
+        :param seq: a string
         :param trials:
         :return:
         """
-        pass
+        costs = {}
+        for c in list(seq):
+            if costs.__contains__(c):
+                costs[c] += 1.0
+            else:
+                costs.setdefault(c, 1.0)
+        return max(list(costs.values()))
 
     def fitness(self, seq):
         """