diff --git a/3.py b/3.py
new file mode 100644
index 0000000..da5938e
--- /dev/null
+++ b/3.py
@@ -0,0 +1,29 @@
+import sys
+import heapq
+
+output_two = 0
+output_twelve = 0
+file = '3.input' if len(sys.argv) <= 1 else sys.argv[1]
+for line in open(file).readlines():
+    first_seen = {} # digit to first index
+    last_seen = {} # digit to last index
+    for i, digit in enumerate(line.strip()):
+        first_seen.setdefault(int(digit), i)
+        last_seen[int(digit)] = i
+    
+    max_all = max(first_seen.keys()) # largest digit (always included)
+    if last_seen[max_all] > first_seen[max_all]: # if it appears twice, just use it
+        output_two += max_all * 11
+        continue
+
+    try:
+        # first search right of the max digit
+        max_right = max(digit for digit, i in last_seen.items() if i > first_seen[max_all])
+        output_two += max_all * 10 + max_right
+    except ValueError:
+        # search left for max digit
+        max_left = max(digit for digit, i in last_seen.items() if i < first_seen[max_all])
+        output_two += max_left * 10 + max_all
+
+print(f'p1: {output_two}')
+print(f'p2: {output_twelve}')
\ No newline at end of file
diff --git a/3.test b/3.test
new file mode 100644
index 0000000..6b1df6a
--- /dev/null
+++ b/3.test
@@ -0,0 +1,4 @@
+987654321111111
+811111111111119
+234234234234278
+818181911112111
\ No newline at end of file