import java.util.Scanner;
import java.util.Arrays;

public class MinAbsDiff {
public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    int n = in.nextInt();
    int[] a = new int[n];
    for(int a_i=0; a_i < n; a_i++){
        a[a_i] = in.nextInt();
    }
    // your code goes here
    int value = Integer.MAX_VALUE;
    Arrays.sort(a);
    for(int i=1;i<n;i++){
        if(Math.abs((a[i-1]-a[i])) < value)
            value = Math.abs((a[i-1]-a[i]));
    }
    System.out.println(value);
}
}