diff --git a/Cargo.lock b/Cargo.lock
index 71c57a0..6e8578a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -7,6 +7,7 @@ name = "advent_of_code_2025"
 version = "0.1.0"
 dependencies = [
  "grid",
+ "sanitise-file-name",
 ]
 
 [[package]]
@@ -14,3 +15,9 @@ name = "grid"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f9e2d4c0a8296178d8802098410ca05d86b17a10bb5ab559b3fb404c1f948220"
+
+[[package]]
+name = "sanitise-file-name"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19d36299972b96b8ae7e8f04ecbf75fb41a27bf3781af00abcf57609774cb911"
diff --git a/Cargo.toml b/Cargo.toml
index 3c13b18..b379acd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,3 +5,4 @@ edition = "2024"
 
 [dependencies]
 grid = "1.0.0"
+sanitise-file-name = "1.0.0"
diff --git a/src/solvers.rs b/src/solvers.rs
index 176f11e..15877df 100644
--- a/src/solvers.rs
+++ b/src/solvers.rs
@@ -1,6 +1,8 @@
+use sanitise_file_name;
 use std::fs::File;
 use std::io;
 use std::io::BufRead;
+use std::path;
 use std::path::Path;
 
 pub mod cafeteria;
@@ -10,12 +12,13 @@ pub mod trash_compactor;
 pub trait Solver {
     const PUZZLE_INDEX: u8;
     const PUZZLE_NAME: &'static str;
-    // TODO: Replace constant input filename by a conversion from the puzzle name in the runner.
-    const INPUT_FILENAME: &'static str;
 
-    fn puzzle_index(&self) -> u8 { Self::PUZZLE_INDEX }
-    fn puzzle_name(&self) -> &'static str { Self::PUZZLE_NAME }
-    fn input_filename(&self) -> &'static str { Self::INPUT_FILENAME }
+    fn puzzle_index(&self) -> u8 {
+        Self::PUZZLE_INDEX
+    }
+    fn puzzle_name(&self) -> &'static str {
+        Self::PUZZLE_NAME
+    }
 
     fn process_data<R: BufRead>(&self, reader: R) -> (u64, u64);
 }
@@ -32,7 +35,11 @@ pub fn run<S: Solver>(solver: S) {
     // "target/release/" directory with "data/" directory in package root or parent directory.
     let paths = vec!["./data", "../data", "../../data", "../../../data"];
 
-    match read_data_file(solver.input_filename(), &paths) {
+    let filename = sanitise_file_name::sanitise(solver.puzzle_name())
+        .to_lowercase()
+        .replace(" ", "_")
+        + ".txt";
+    match read_data_file(filename, &paths) {
         Ok(reader) => {
             let result = solver.process_data(reader);
             print_result(result);
@@ -45,10 +52,7 @@ fn print_result(result: (u64, u64)) {
     println!("Part 1: {:?}\nPart 2: {:?}\n", result.0, result.1);
 }
 
-fn read_data_file<T>(
-    filename: T,
-    search_paths: &Vec<T>,
-) -> Result<io::BufReader<File>, String>
+fn read_data_file<T>(filename: String, search_paths: &Vec<T>) -> Result<io::BufReader<File>, String>
 where
     T: AsRef<Path>,
 {
@@ -60,7 +64,11 @@ where
 
     let message = search_paths
         .iter()
-        .map(|path| path.as_ref().join(&filename).display().to_string())
+        .filter_map(|p| {
+            path::absolute(p.as_ref().join(&filename))
+                .ok()
+                .and_then(|p| Some(p.display().to_string()))
+        })
         .collect::<Vec<_>>()
         .join("\n");
     Err(format!(
diff --git a/src/solvers/cafeteria.rs b/src/solvers/cafeteria.rs
index dbc9fb4..89b919f 100644
--- a/src/solvers/cafeteria.rs
+++ b/src/solvers/cafeteria.rs
@@ -8,7 +8,6 @@ pub struct Cafeteria {}
 impl Solver for Cafeteria {
     const PUZZLE_INDEX: u8 = 5;
     const PUZZLE_NAME: &'static str = "Cafeteria";
-    const INPUT_FILENAME: &'static str = "cafeteria.txt";
 
     fn process_data<R: BufRead>(&self, mut reader: R) -> (u64, u64) {
         // Builds intervals collection.
diff --git a/src/solvers/printing_department.rs b/src/solvers/printing_department.rs
index ed001e9..1c865b8 100644
--- a/src/solvers/printing_department.rs
+++ b/src/solvers/printing_department.rs
@@ -7,7 +7,6 @@ pub struct PrintingDepartment {}
 impl Solver for PrintingDepartment {
     const PUZZLE_INDEX: u8 = 4;
     const PUZZLE_NAME: &'static str = "Printing Department";
-    const INPUT_FILENAME: &'static str = "printing_department.txt";
 
     fn process_data<R: BufRead>(&self, reader: R) -> (u64, u64) {
         let mut grid = Grid::new(0, 0);
diff --git a/src/solvers/trash_compactor.rs b/src/solvers/trash_compactor.rs
index ca38b11..f4eca2a 100644
--- a/src/solvers/trash_compactor.rs
+++ b/src/solvers/trash_compactor.rs
@@ -7,7 +7,6 @@ pub struct TrashCompactor {}
 impl Solver for TrashCompactor {
     const PUZZLE_INDEX: u8 = 6;
     const PUZZLE_NAME: &'static str = "Trash Compactor";
-    const INPUT_FILENAME: &'static str = "trash_compactor.txt";
 
     fn process_data<R: BufRead>(&self, reader: R) -> (u64, u64) {
         let mut part1 = 0;