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diff --git a/print_mutual_friends.py b/print_mutual_friends.py
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+++ b/print_mutual_friends.py
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+# Copyright 2015 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is licensed under the terms of the MIT License.
+# See LICENSE.txt for details.
+
+import api
+
+def users_get(user_ids):
+    return api.users_get(user_ids=','.join(user_ids))
+
+def friends_get(user_id):
+    return api.friends_get(user_id=user_id)
+
+def format_user_name(user):
+    return '{} {}'.format(user['last_name'], user['first_name'])
+
+def join_user_names(user_names):
+    return '{} and {}'.format(', '.join(user_names[:-1]), user_names[-1])
+
+def print_mutual_friends(users, mutual_friends):
+    user_names = list(map(format_user_name, users))
+    user_names = join_user_names(user_names)
+    if not mutual_friends:
+        print('{} don\'t have any mutual friends'.format(user_names))
+    else:
+        print('{} are friends with these guys:'.format(user_names))
+        for friend in mutual_friends:
+            print('\t{}'.format(format_user_name(friend)))
+
+if __name__ == '__main__':
+    import argparse
+    parser = argparse.ArgumentParser()
+    parser.add_argument(metavar='UID', dest='user_ids', nargs='+',
+                        help='user IDs or "screen names"')
+    args = parser.parse_args()
+    users = users_get(args.user_ids)
+    user_ids = map(lambda user: user['uid'], users)
+    friend_lists = map(friends_get, user_ids)
+    friend_lists = map(frozenset, friend_lists)
+    mutual_friends = frozenset.intersection(*friend_lists)
+    if mutual_friends:
+        mutual_friends = users_get(map(str, mutual_friends))
+    print_mutual_friends(users, mutual_friends)