diff --git a/y2015/src/bin/d7.rs b/y2015/src/bin/d7.rs
index 4c97378..f35d80b 100644
--- a/y2015/src/bin/d7.rs
+++ b/y2015/src/bin/d7.rs
@@ -16,5 +16,5 @@ fn part1() {
 fn part2() {
     let root = env!("CARGO_MANIFEST_DIR");
     let content = fs::read_to_string(format!("{root}/resources/7_input.txt")).unwrap();
-    println!("{:#?}", d7::process_part2(&content));
+    println!("{}", d7::process_part2(&content).get("a").unwrap());
 }
diff --git a/y2015/src/days/d7.rs b/y2015/src/days/d7.rs
index 9ebaca6..9ddc88a 100644
--- a/y2015/src/days/d7.rs
+++ b/y2015/src/days/d7.rs
@@ -81,7 +81,24 @@ fn set_wire(
     panic!("Should not happen");
 }
 
-pub fn process_part2(_input: &str) {}
+pub fn process_part2(input: &str) -> HashMap<String, u16> {
+    let mut wires = HashMap::new();
+    let mut instructions = HashMap::new();
+    for instruction in input.lines() {
+        let (expression, wire) = instruction.split_once(" -> ").unwrap();
+        instructions.insert(wire.to_string(), expression.to_string());
+    }
+    for wire in instructions.keys() {
+        set_wire(wire.to_string(), &mut wires, &instructions);
+    }
+    let new_b = wires.get("a").unwrap();
+    instructions.insert("b".to_string(), new_b.to_string());
+    let mut wires = HashMap::new();
+    for wire in instructions.keys() {
+        set_wire(wire.to_string(), &mut wires, &instructions);
+    }
+    wires
+}
 
 #[cfg(test)]
 mod tests_7 {