object Solution {

    def main(args: Array[String]) {
        val sc = new java.util.Scanner (System.in);
        var n = sc.nextInt();
        var a = new Array[Int](n);
        for(a_i <- 0 to n-1) {
           a(a_i) = sc.nextInt();
        }

        val b = a.sorted
        
        val dif = for(i <- 0 to (b.size-2)) yield Math.abs(b(i)-b(i+1))
        
        println(dif.sorted.head)
        
    }
}