#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset
#include <cmath>		//sqrt, ceil. M_PI, pow, sin
#include <ios>			//fixed
#include <iomanip>		//setprecision

using namespace std;

int main() {

	int N;
	cin >> N;

	vector<int> X(N);
	for (int i = 0; i < N; i++) {
		cin >> X[i];
	}

	sort(X.begin(), X.end());
	X.erase(unique(X.begin(), X.end()), X.end());

	if (X.size() <= 1) {
		cout << 0 << endl;
	}
	else {
		int min = INT_MAX;
		int temp;
		for (unsigned int i = 0; i < X.size() - 1; i++) {
			temp = X[i + 1] - X[i];
			if (temp < min) {
				min = temp;
			}
		}
		cout << min << endl;
	}

	return 0;

}