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();
        }
        var minAbs = 10000
        a = a.sorted
        for(x <- 0 until a.length-1){
            val tmp = math.abs(a(x)-a(x+1))
            minAbs = if(tmp < minAbs) tmp else minAbs
        }
        print(minAbs)
    }
}