import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        Long[] input = new Long[n];
        for(int a_i=0; a_i < n; a_i++){
            input[a_i] = in.nextLong();
        }

        List<Long> ordered = Arrays.asList(input);
        Collections.sort(ordered);

        Long minDif = Long.MAX_VALUE;
        for (int i = 0; i < ordered.size()-1; i++) {
            minDif = Math.min(Math.abs(ordered.get(i)-ordered.get(i+1)), minDif);
        }

        System.out.println(minDif);
    }
}