diff --git a/challenge.py b/challenge.py
index 93a85f8..b3132e3 100644
--- a/challenge.py
+++ b/challenge.py
@@ -74,11 +74,43 @@
 
 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
+    # Normal: [value for value in DATA if value['language'] in 'python']
+    # Using filter, generate a list with all the python devs
+    all_python_devs = filter(
+        lambda value: value['language'] in 'python' and value['language'], DATA)
+
+    # Using filter, generate a list with all the Platzi workers
+    all_Platzi_workers = filter(
+        lambda value: value['organization'] in 'Platzi' and value['organization'], DATA)
+
+    # Using filter, generate a list with all people over 18 years old
+    adults = filter(
+        lambda value: value['age'] > 17 and value['age'], DATA)
+
+    # 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 = list(dict.fromkeys(map(lambda value: value['organization']
+    #                                     if value['organization'] else 'homeless', DATA)))
+    workers = list(map(
+        lambda value: value if value['organization'] else {
+            'name': value['name'],
+            'age': value['age'],
+            'organization': 'homeless',
+            'position': value['position'],
+            'language': value['language'],
+        }, DATA))
+
+    # 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
+    # old_people = list(dict.fromkeys(map(lambda value: value['age']
+    #                                     if value['age'] > 30 else 'old', DATA)))
+    old_people = list(map(
+        lambda value: value
+        if value['age'] > 30 else {
+            'name': value['name'],
+            'age': 'old',
+            'organization':  value['organization'],
+            'position': value['position'],
+            'language': value['language'],
+        }, DATA))
 
     print('Python devs: ')
     for dev in all_python_devs: