diff --git a/2022/day1.py b/2022/day1.py
index 0a20466..af1a525 100644
--- a/2022/day1.py
+++ b/2022/day1.py
@@ -1,9 +1,8 @@
 # -*- encoding: utf-8 -*-
 
-from pathlib import Path
+import sys
 
-with open(Path(__file__).parent.joinpath("inputs", "day1.txt")) as fp:
-    lines = fp.readlines()
+lines = sys.stdin.readlines()
 
 # we store the list of calories for each elf in values, and we use the last element
 # of values to accumulate
diff --git a/2022/day2.py b/2022/day2.py
index 132654e..fc68605 100644
--- a/2022/day2.py
+++ b/2022/day2.py
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
 
-from pathlib import Path
+import sys
+
+lines = sys.stdin.readlines()
 
 # the solution relies on replacing rock / paper / scissor by values 0 / 1 / 2 and using
 # modulo-3 arithmetic
@@ -11,10 +13,7 @@ from pathlib import Path
 
 # we read the lines in a Nx2 in array with value 0/1/2 instead of A/B/C or X/Y/Z for
 # easier manipulation
-with open(Path(__file__).parent.joinpath("inputs", "day2.txt")) as fp:
-    values = [
-        (ord(row[0]) - ord("A"), ord(row[2]) - ord("X")) for row in fp.readlines()
-    ]
+values = [(ord(row[0]) - ord("A"), ord(row[2]) - ord("X")) for row in lines]
 
 
 def score_1(ux: int, vx: int) -> int:
diff --git a/2022/day3.py b/2022/day3.py
new file mode 100644
index 0000000..9391aa7
--- /dev/null
+++ b/2022/day3.py
@@ -0,0 +1,25 @@
+# -*- encoding: utf-8 -*-
+
+import string
+import sys
+
+lines = [line.strip() for line in sys.stdin.readlines()]
+
+# extract content of each part
+parts = [(set(line[: len(line) // 2]), set(line[len(line) // 2 :])) for line in lines]
+
+# priorities
+priorities = {c: i + 1 for i, c in enumerate(string.ascii_letters)}
+
+# part 1
+part1 = sum(priorities[c] for p1, p2 in parts for c in p1.intersection(p2))
+print(f"score 1 is {part1}")
+
+# part 2
+n_per_group = 3
+part2 = sum(
+    priorities[c]
+    for i in range(0, len(lines), n_per_group)
+    for c in set.intersection(*map(set, (lines[i : i + n_per_group])))
+)
+print(f"score 2 is {part2}")
diff --git a/2022/inputs/day3.txt b/2022/inputs/day3.txt
new file mode 100644
index 0000000..6cef3e4
--- /dev/null
+++ b/2022/inputs/day3.txt
@@ -0,0 +1,300 @@
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+JbCmrbnzmntnVJjbCHJJFQFvqgJgQgqLDQ
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+tGNgtsNQHsJmwwzddmQw
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9f7469c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,7 @@
+# Advent Of Code
+
+To run any script, you need to pipe the input:
+
+```bash
+cat 2022/inputs/day2.txt | python 2022/day2.py
+```