02. Letters Combinations

package main

import "fmt"

func main() {
    var a, b, c string
    fmt.Scanln(&a)
    fmt.Scanln(&b)
    fmt.Scanln(&c)

    x := int(rune(a[0]))
    y := int(rune(b[0]))
    z := int(rune(c[0]))

    var counter = 0

    for i := x; i <= y; i++ {
        for k := x; k <= y; k++ {
            for j := x; j <= y; j++ {
                if i != z && k != z && j != z {
                    fmt.Printf("%c%c%c ", i, k, j)
                    counter++
                }
            }
        }
    }
    fmt.Println(counter)
}