diff --git a/Day7/Day7.py b/Day7/Day7.py
deleted file mode 100644
index 5448acb..0000000
--- a/Day7/Day7.py
+++ /dev/null
@@ -1,27 +0,0 @@
-import fileinput
-from collections import defaultdict
-
-def work_seconds(node):
-    return ord(node) - ord('A') + 60
-
-graph = defaultdict(set)
-for line in fileinput.input():
-    a = line[5]
-    b = line[36]
-
-    graph[b].add(a)
-    graph[a]
-
-order = []
-to_consider = sorted(graph.keys())
-while to_consider:
-    for i, node in enumerate(to_consider):
-        parents = graph[node]
-        if any(parent in to_consider for parent in parents):
-            continue
-
-        order.append(node)
-        del to_consider[i]
-        break
-
-print("".join(order))
diff --git a/Day7/Day7A.py b/Day7/Day7A.py
new file mode 100644
index 0000000..ed6e718
--- /dev/null
+++ b/Day7/Day7A.py
@@ -0,0 +1,32 @@
+import fileinput
+from collections import defaultdict
+
+def build_graph():
+    graph = defaultdict(list)
+    for line in fileinput.input():
+        a, b = line[5], line[36]
+        graph[b].append(a)
+        graph[a]
+
+    return graph
+
+
+def main():
+    graph = build_graph()
+
+    order = []
+    to_consider = sorted(graph.keys())
+    while to_consider:
+        for i, node in enumerate(to_consider):
+            parents = graph[node]
+            if any(parent in to_consider for parent in parents):
+                continue
+
+            order.append(node)
+            del to_consider[i]
+            break
+
+    print("".join(order))
+
+if __name__ == "__main__":
+    main()
diff --git a/Day7/Day7B.py b/Day7/Day7B.py
new file mode 100644
index 0000000..d7d507e
--- /dev/null
+++ b/Day7/Day7B.py
@@ -0,0 +1,82 @@
+import fileinput
+from collections import defaultdict
+from Day7A import build_graph
+
+WORKERS = 5
+BASE_TIME = 60
+
+graph = build_graph()
+
+order = []
+to_consider = sorted(graph.keys())
+
+worker_nodes = [None] * WORKERS
+worker_times = [None] * WORKERS
+active_workers = 0
+time = 0
+
+def work_seconds(node):
+    return ord(node) - ord('A') + BASE_TIME
+
+def start_work(worker, node):
+    global active_workers
+
+    worker_nodes[worker] = node
+    worker_times[worker] = work_seconds(node)
+    active_workers += 1
+
+def update_workers():
+    global time
+    global active_workers
+
+    for i in range(WORKERS):
+        if worker_nodes[i] is None:
+            continue
+
+        if worker_times[i]:
+            worker_times[i] -= 1
+        else:
+            active_workers -= 1
+            worker_nodes[i] = None
+
+    time += 1
+
+def print_status():
+    worker_status = "".join(node if node else "." for node in worker_nodes)
+    todo = "".join(to_consider)
+    print(f"{time:>4d}  {worker_status:<7}  [{todo}]")
+
+def main():
+    global active_workers
+
+    print("Time  Workers  To Do")
+    while to_consider or active_workers:
+        last_count = -1
+        while last_count != active_workers:
+            last_count = active_workers
+
+            for i, node in enumerate(to_consider):
+                parents = graph[node]
+                if node in worker_nodes:
+                    continue
+
+                if any(parent in worker_nodes or parent in to_consider
+                       for parent in parents):
+                    continue
+
+                for w_id in range(WORKERS):
+                    if worker_nodes[w_id] is None:
+                        start_work(w_id, node)
+                        break
+                else:
+                    break
+
+                del to_consider[i]
+                continue
+
+        print_status()
+        update_workers()
+
+    print_status()
+
+main()