Password Generator

package main

import (
  "fmt"
  "os"
)

func main() {
    var a, d, e, f, counter int
    var b, c string
    fmt.Scanln(&a)
    fmt.Scanln(&b)
    fmt.Scanln(&c)
    fmt.Scanln(&d)
    fmt.Scanln(&e)
    fmt.Scanln(&f)
    fmt.Scanln(&counter)

    for i := 1; i <= a; i++ {
        for j := int('A'); j <= int(b[0]); j++ {
            for k := int('a'); k <= int(c[0]); k++ {
                for l := 1; l <= d; l++ {
                    for m := 1; m <= e; m++ {
                        for n := 1; n <= f; n++ {
                            counter--
                            if counter == 0 {
                                fmt.Printf("%d%c%c%d%d%d\n", i, j, k, l, m, n)
                                os.Exit(0)
                            }
                        }
                    }
                }
            }
        }
    }

    fmt.Println("No password on this position")
}