import java.util.*;
import java.util.stream.*;
import static java.lang.System.*;
import java.io.*;

class Main {
//	static Scanner sc = new Scanner(System.in);
	static int maxInt = Integer.MAX_VALUE;
	static int minInt = Integer.MIN_VALUE;
//	static int nextInt () {return Integer.parseInt(sc.next());}
//	static int[] nextIntArray (int n) {return IntStream.range(0,n).map(i->nextInt()).toArray();}
	static int max (int... ar) {Arrays.sort(ar);return ar[ar.length-1];}
	static int min (int... ar) {Arrays.sort(ar);return ar[0];}
	
	
	static FastScanner sc = new FastScanner();
	public static void main(String[] args) {
		//MAIN----------------------------------------------------------
		
		int n = sc.nextInt();
		if (n == 1) {
			System.out.println(0); return;
		}
		else {
			int[] ar = new int[n];
			for (int i=0; i<n; i++) ar[i] = sc.nextInt();
			Arrays.sort(ar);
			int min = Integer.MAX_VALUE;
			for (int i=1; i<n; i++) {
				if (ar[i]-ar[i-1] != 0) {
					min = Math.min(min, ar[i]-ar[i-1]);
				}
			}
			System.out.println(min==Integer.MAX_VALUE?0:min);
		}
		
		//--------------------------------------------------------------
	}
}


class FastScanner {
	private InputStream in = System.in;
	private byte[] buffer = new byte[10];
	private int length = 0;
	private int p = 0;

	boolean hasNextByte () {
		if (p < length) return true;
		else {
			p = 0;
			try {length = in.read(buffer);}
			catch (Exception e) {e.printStackTrace();}
			if (length == 0) return false;
		}
		return true;
	}

	int readByte () {
		if (hasNextByte() == true) return buffer[p++];
		return -1;
	}

	boolean isPrintable (int n) {return 33<=n&&n<=126;}
	void skip () {
		while (hasNextByte() && !isPrintable(buffer[p])) p++;
	}
	boolean hasNext () {skip(); return hasNextByte();}
	
	String next () {
		if (!hasNext()) throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int temp = readByte();
		while (isPrintable(temp)) {
			sb.appendCodePoint(temp);
			temp = readByte();
		}
		return sb.toString();
	}
	
	int nextInt () {
		if (!hasNext()) throw new NoSuchElementException();
		boolean minus = false;
		int temp = readByte();
		if (temp == '-') {
			minus = true;
			temp = readByte();
		}
		int n = 0;
		while (true) {
			if ('0'<=temp && temp<='9') {
				n *= 10;
				n += temp - '0';
			}
			else if (temp==-1 || !isPrintable(temp)) {
				return minus? -n : n;
			}
			else {
				throw new NumberFormatException();
			}
			temp = readByte();
		}
	}
}