diff --git a/bluetooth.py b/bluetooth.py
new file mode 100644
index 0000000..d11be53
--- /dev/null
+++ b/bluetooth.py
@@ -0,0 +1,36 @@
+n = int(input())
+
+uleft = set(range(1, 9))
+uright = set(range(1, 9))
+lleft = set(range(1, 9))
+lright = set(range(1, 9))
+
+for _ in range(n):
+    dental_problem = input().split()
+
+    try:
+        if dental_problem[1] == "m":
+            if dental_problem[0][0] == "-":
+                lleft.remove(int(dental_problem[0][1]))
+            elif dental_problem[0][0] == "+":
+                uleft.remove(int(dental_problem[0][1]))
+            elif dental_problem[0][1] == "-":
+                lright.remove(int(dental_problem[0][0]))
+            elif dental_problem[0][1] == "+":
+                uright.remove(int(dental_problem[0][0]))
+        else:
+            if dental_problem[0][0] == "+" or dental_problem[0][0] == "-":
+                lleft = set()
+                uleft = set()
+            else:
+                lright = set()
+                uright = set()
+    except KeyError:
+        pass
+
+if len(lleft) > 0 and len(uleft) > 0:
+    print(0)
+elif len(lright) > 0 and len(uright) > 0:
+    print(1)
+else:
+    print(2)