diff --git a/d09/part1.py b/d09/part1.py
deleted file mode 100644
index 358e22c..0000000
--- a/d09/part1.py
+++ /dev/null
@@ -1,11 +0,0 @@
-import sys
-
-L = [list(map(int,l.split(' '))) for l in sys.stdin.read().splitlines()]
-
-def extrapolate(L):
-    if all(not a for a in L):
-        return L+[0]
-    M = [b-a for a,b in zip(L,L[1:])]
-    return L+[L[-1]+extrapolate(M)[-1]]
-
-print(sum(extrapolate(l)[-1] for l in L))
diff --git a/d09/part2.py b/d09/part2.py
deleted file mode 100644
index ad8aa8b..0000000
--- a/d09/part2.py
+++ /dev/null
@@ -1,11 +0,0 @@
-import sys
-
-L = [list(map(int,l.split(' '))) for l in sys.stdin.read().splitlines()]
-
-def extrapolate(L):
-    if all(not a for a in L):
-        return [0]+L
-    M = [b-a for a,b in zip(L,L[1:])]
-    return [L[0]-extrapolate(M)[0]]+L
-
-print(sum(extrapolate(l)[0] for l in L))
diff --git a/d09/run.py b/d09/run.py
new file mode 100644
index 0000000..4914723
--- /dev/null
+++ b/d09/run.py
@@ -0,0 +1,12 @@
+import sys
+
+L = [list(map(int,l.split(' '))) for l in sys.stdin.read().splitlines()]
+
+def extrapolate(L):
+    if all(a == 0 for a in L):
+        return 0
+    M = [b-a for a,b in zip(L,L[1:])]
+    return L[-1]+extrapolate(M)
+
+print(sum(extrapolate(l) for l in L))
+print(sum(extrapolate(l[::-1]) for l in L))