Минимальное расстояние

package main
import "fmt"
import "github.com/skorobogatov/input"

func main() {
    var x, y rune
    var i, min, current, pos_x, pos_y int
        min = 1000000

    str := input.Gets ()
    input.Scanf("%c %c", &x, &y)

        var first, last int

        i = 0
    for _, p := range str {
                i++
        if p == x { //нашли x
            pos_x = i
        }
        if p == y { //нашли y
            pos_y = i
        }

        if (p == x || p == y) && (0 < pos_x && 0 < pos_y) {
                        current = pos_x - pos_y
                        /*if 0 == current {
                                min = current
                    goto exit
                    }*/
            if 0 > current {
                current *= -1
            }
            if current < min {
                min = current
            }
                        if 0 == (min - 1) {
                                goto exit
                        }
        }
    }
        exit:
        min -= 1
    fmt.Printf("%d", min)
}