#define _USE_MATH_DEFINES	//M_PI
#include <iostream>			//std::cout, std::cin
#include <string>			//std::string
#include <vector>			//std::vector
#include <valarray>			//std::valarray	数値のみの一次配列
#include <algorithm>		//std::sort
#include <time.h>			//localtime_s
#include <cstdlib>			//abs
#include <cmath>			//abs, std::pow, sqrt, sin, cos,
#include <fstream>			//std::ifstream
#include <iomanip>			//std::setprecision
#include <random>			//std::random(C++11)
#include <numeric>			//std::accumulate

int main(void) {

	//test用
	//std::ifstream in("test.txt");
	//std::cin.rdbuf(in.rdbuf());

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

	int min = 0;
	bool flg = true;
	
	if (N == 1) {
		flg = false;
	}

	if (flg) {
		flg = false;
		for (int i = 0; i < N; i++) {
			if (X[0] != X[i]) {
				flg = true;
			}
		}
	}

	if (flg) {
		min = 1000000;
		int temp = 0;
		std::sort(X.begin(), X.end());
		for (int i = 0; i < N - 1; i++) {
			if (X[i] != X[i + 1]) {
				temp = X[i + 1] - X[i];
				if (temp <= min) {
					min = temp;
				}
			}
		}
	}

	std::cout << min << std::endl;
}