Letters Combinations

package main

import "fmt"

func main() {
    var x, y, z string
    fmt.Scanln(&x)
    fmt.Scanln(&y)
    fmt.Scanln(&z)

    counter := 0

    for i := int(x[0]); i <= int(y[0]); i++ {
        for k := int(x[0]); k <= int(y[0]); k++ {
            for j := int(x[0]); j <= int(y[0]); j++ {
                if i != int(z[0]) && k != int(z[0]) && j != int(z[0]) {
                    fmt.Printf("%c%c%c ", i, k, j)
                    counter++
                }
            }
        }
    }

    fmt.Println(counter)
}