import math._
import scala.util._

/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/
object Solution extends App {
    val n = readInt
    val strengths = (1 to n).map(_ => readInt).sortWith(_ < _)
    val diffs = strengths.sliding(2).map(l => Math.abs(l(0) - l(1)))

    println(diffs.reduceLeft(_ min _))
}