#define REP(i, n) for(int i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
#define EPS (1e-7)
#define INF (1e9)
#define PI (acos(-1))

#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main() {
	int n;
	cin >> n;
	int data[n];
	REP(i,n) cin >> data[i];

	sort(data,data+n);
	int ans = INF;
	REP(i,n-1){
		if(ans > (data[i+1] - data[i])) {
			if(!(data[i+1] == data[i])) ans = data[i+1]-data[i];
		}
	}
	if(ans == INF) ans = 0;
	cout << ans << endl;
	return 0;
}