#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin >> n;
	long long int a[n];
	for(int i=0;i<n;i++)
		cin >> a[i];
	sort(a,a+n);
	long long int diff[n+1];
	for(int i=1;i<n;i++){
		diff[i]=abs(a[i]-a[i-1]);
	}
	diff[0]=1000000000000;
	sort(diff,diff+n);
	cout << diff[0]<<endl;
	return 0;
}