import scala.io.StdIn
    
object Solution {

    def main(args: Array[String]) {
        val n = StdIn.readInt()
        val numbers = StdIn.readLine().split(" ").map(_.toInt).toVector
        val sorted = numbers.sorted
        println((0 until n - 1).map(i => sorted(i + 1) - sorted(i)).min)
    }
}