diff --git a/rust_impl/Cargo.lock b/rust_impl/Cargo.lock
new file mode 100644
index 0000000..13c5cb5
--- /dev/null
+++ b/rust_impl/Cargo.lock
@@ -0,0 +1,223 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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diff --git a/rust_impl/Cargo.toml b/rust_impl/Cargo.toml
index 1e92a90..c920d50 100644
--- a/rust_impl/Cargo.toml
+++ b/rust_impl/Cargo.toml
@@ -7,3 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+structopt = "0.3.21"
diff --git a/rust_impl/src/main.rs b/rust_impl/src/main.rs
index e7a11a9..fc7d9b3 100644
--- a/rust_impl/src/main.rs
+++ b/rust_impl/src/main.rs
@@ -1,3 +1,22 @@
-fn main() {
-    println!("Hello, world!");
+use structopt::StructOpt;
+use std::collections::HashMap;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "RunLengthEncoding")]
+struct Opts {
+    input: String,
+}
+
+fn main() {
+    let opts = Opts::from_args();
+
+    let mut map: HashMap<char, u32> = HashMap::new();
+
+    for c in opts.input.chars() {
+        map.get_mut(&c).map(|v| *v += 1).or_else(|| {map.insert(c, 1); Some(())});
+    }
+
+    for (c, value) in map {
+        println!("{} with value {}", c, value);
+    }
 }