diff --git a/2022/day3.py b/2022/day3.py
new file mode 100644
index 0000000..da6bc3f
--- /dev/null
+++ b/2022/day3.py
@@ -0,0 +1,29 @@
+with open('day3-input', 'r') as file:
+    input = file.read().strip().split('\n')
+
+def prio(character):
+    if 'a' <= character <= 'z':
+        return ord(character) - ord('a') + 1
+    return ord(character) - ord('A') + 27
+
+
+s = 0
+for line in input:
+    l = len(line)//2
+    left = set(line[:l])
+    right = set(line[l:])
+    common = left & right
+    character = list(common)[0]
+    s += prio(character)
+print(s)  # Part 1 answer
+
+
+s = 0
+for group in range(len(input)//3):
+    e1 = set(input[group*3])
+    e2 = set(input[group*3+1])
+    e3 = set(input[group*3+2])
+    common = e1 & e2 & e3
+    character = list(common)[0]
+    s += prio(character)
+print(s)  # Part 2 answer
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