import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.stream.Stream;

public class No00000135_Main {

	public static void main(String[] args) throws IOException {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		int n = Integer.parseInt(br.readLine());
		int[] arr = Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
		Arrays.sort(arr);
		boolean first = true;
		int dis = 0;
		for(int i = 1; i < n; i++) {
			if(arr[i - 1] != arr[i]) {
				if(first) {
					first = false;
					dis = Math.abs(arr[i] - arr[i - 1]);
				}
				dis = Math.min(dis, Math.abs(arr[i] - arr[i - 1]));
			}
		}
		System.out.println(dis);
	}
}