package main

import . "fmt"
import . "slices"

func main() {
	var n int
	Scan(&n)
	x:=make([]int,n)
	for i:=range x {
		Scan(&x[i])
	}
	Sort(x)
	x=Compact(x)
	if len(x)<2 {
		Println(0)
		return
	}
	for i,v:=range x[1:] {
		x[i]=v-x[i]
	}
	Println(Min(x))
}