diff --git a/05-1-1.py b/05-1-1.py
new file mode 100644
index 0000000..32bc94b
--- /dev/null
+++ b/05-1-1.py
@@ -0,0 +1 @@
+print(sorted(map(lambda x:int(''.join(map(lambda y:'01'[int(y in'BR')],x)),2),open(0)))//2)
diff --git a/05-2-1.py b/05-2-1.py
new file mode 100644
index 0000000..10fa544
--- /dev/null
+++ b/05-2-1.py
@@ -0,0 +1 @@
+print(set(s:=sorted(map(lambda x:int(''.join(map(lambda y:'01'[int(y in'BR')],x)),2)//2, open(0))))^set(range(s[0],s[-1]+1)))