day 2 part 1

2.py

@@ -0,0 +1,6 @@
+with open("input2_pre.txt") as f:
+    s = 0
+    for line in f.readlines():
+        a, b = [int(a) for a in line.strip().split()]
+        s += b + ((3, 0, 6)[((a - b) % 3)])
+    print(s)

2_preproc.sh

@@ -0,0 +1 @@
+cat input2.txt | sed "s/X/A/g" | sed "s/Y/B/g" | sed "s/Z/C/g" | sed "s/A/1/g" | sed "s/B/2/g"| sed "s/C/3/g" > input2_pre.txt