#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define sz(n) (int)(n).size()
using namespace std;
typedef long long ll;
typedef vector<int> VI;

int main() {
	int n;
	cin >> n;
	VI x;
	REP(i, n) {
		int t;
		cin >> t;
		x.push_back(t);
	}
	sort(x.begin(), x.end());
	int ans = 1000000;
	if (!(x[0] == x[n - 1])) {
		REP(i, n - 1) if (x[i] - x[i + 1]) ans = (ans > abs(x[i] - x[i + 1])) ? abs(x[i] - x[i + 1]) : ans;
	}
	else {
		ans = 0;
	}
	cout << ans << endl;
	return 0;
}