diff --git a/data/day_3.txt b/data/day_3.txt
new file mode 100644
index 0000000..02370bf
--- /dev/null
+++ b/data/day_3.txt
@@ -0,0 +1,300 @@
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diff --git a/src/day_3.jl b/src/day_3.jl
new file mode 100644
index 0000000..8c45785
--- /dev/null
+++ b/src/day_3.jl
@@ -0,0 +1,15 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+
+priority = ['a':'z'; 'A':'Z']
+
+function p1(input::Vector{String})
+    sum([ findfirst(==(intersect(i[begin:sizeof(i)÷2], i[sizeof(i)÷2+1:end])[1]), priority) for i in input ])
+end
+
+function p2(input::Vector{String})
+    sum([ findfirst(==(foldl(intersect, input[i:i+2])[1]), priority) for i in 1:3:length(input) ])
+end
+
+@aoc(2022, 3)
+