diff --git a/2017/day12.py b/2017/day12.py
index dd62e4f..83d9493 100644
--- a/2017/day12.py
+++ b/2017/day12.py
@@ -12,7 +12,7 @@ for line in input.splitlines():
         neighbors[b].add(a)
 
 
-def connected(start, neighbors) -> int:
+def connected(start, neighbors):
     queue = [start]
     seen = set()
     while queue:
@@ -22,7 +22,21 @@ def connected(start, neighbors) -> int:
 
         seen.add(node)
         queue.extend(neighbors[node])
-    return len(seen)
+    return seen
 
 
-print(connected("0", neighbors))
+def groups(neighbors) -> int:
+    seeds = set(neighbors.keys())
+    count = 0
+
+    while seeds:
+        start = seeds.pop()
+        seen = connected(start, neighbors)
+        seeds.difference_update(seen)
+        count += 1
+
+    return count
+
+
+print(len(connected("0", neighbors)))
+print(groups(neighbors))