diff --git a/2021/data/day3.expected b/2021/data/day3.expected
new file mode 100644
index 0000000..d63b91d
--- /dev/null
+++ b/2021/data/day3.expected
@@ -0,0 +1,2 @@
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diff --git a/2021/data/day3.input b/2021/data/day3.input
new file mode 100644
index 0000000..4e8cfce
--- /dev/null
+++ b/2021/data/day3.input
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