```

package main

import "fmt"

//const (
//  A = 0
//  B = 1
//  C = 2
//)

const (
    A = iota
    B
    C
    D
)

type Color int

const (
    Red Color = iota
    Blue
    Yellow
)

func main() {
    fmt.Println(A, B, C)

    var Y int32 = 1
    fmt.Println(Y + B)

    fmt.Println(Red, Blue, Yellow)
}

```