#include <iostream>
#include <vector>
#include <algorithm>
#include <cstdlib>

using namespace std;

int main(int argc, char const *argv[]) {

	vector<long int> numbers;
	int size;
	long int aux;

	cin >> size;

	for (int i = 0; i < size; ++i) {
		cin >> aux;

		numbers.push_back(aux);
	}

	sort(numbers.begin(), numbers.end());

//	for (int i = 0; i < size; ++i) {
//		cout << numbers[i] << ' ';
//	}

//	cout << '\n';

	aux = 10e9;

	for (int i = 0; i < size - 1; ++i) {
		if (aux > abs(numbers[i] - numbers[i + 1])) {
			aux = abs(numbers[i] - numbers[i + 1]);
		}
	}

	cout << aux << '\n';

	numbers.clear();

	return 0;
}