#include<stdio.h>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>
#include <stdio.h>

using namespace std;

int main() {

	int N, X[100005];
	cin >> N;
	for (int i = 0; i < N; i++) cin >> X[i];
	sort(X, X+N);
	int diff = 10000000;
	for (int i = 0; i < N - 1; i++) {
		if(X[i] != X[i + 1]) diff = min(diff, abs(X[i] -X[i+1]));
	}

	if(diff != 10000000) cout << diff << endl;
	else cout << 0 << endl;

	return 0;
}