use std::collections::HashMap;
fn main() {
    let mut colors = HashMap::new();

    colors.insert(String::from("Red"), "Red".len());
    colors.insert(String::from("Blue"), "Blue".len());
    colors.insert(String::from("Yellow"), "Yellow".len());
    println!("{:?}", colors);

    for (key, value) in &colors {
        println!("{}: {}", key, value);
    }
}
