diff --git a/challenge.py b/challenge.py
index 93a85f8..b1d55f0 100644
--- a/challenge.py
+++ b/challenge.py
@@ -74,11 +74,20 @@
 
 def run():
 
-    all_python_devs =  # Using filter, generate a list with all the python devs
-    all_Platzi_workers =  # Using filter, generate a list with all the Platzi workers
-    adults =  # Using filter, generate a list with all people over 18 years old
-    workers =  # Using map, generate a new list of people with a key 'homeless' with True or False values, if 'organization' have something or not
-    old_people =  # Using map, generate a new list of people with a key 'old' with True or False values, if 'age' is greater than 30 or not
+    # Using filter, generate a list with all the python devs
+    all_python_devs =  list(filter(lambda item: item['language'] == 'python', DATA))
+    
+    # Using filter, generate a list with all the Platzi workers
+    all_Platzi_workers =  list(filter(lambda item: item['organization'] == 'Platzi', DATA))
+
+    # Using filter, generate a list with all people over 18 years old
+    adults =  list(filter(lambda item: item['age'] > 18, DATA))
+    
+    # Using map, generate a new list of people with a key 'homeless' with True or False values, if 'organization' have something or not
+    workers =  list(map(lambda item: dict(item, **{'homeless': item['organization'] == ''}), DATA ))
+    
+    # Using map, generate a new list of people with a key 'old' with True or False values, if 'age' is greater than 30 or not
+    old_people =  list(map(lambda item: dict(item, **{'old': item['age'] > 30}), DATA))
 
     print('Python devs: ')
     for dev in all_python_devs: