#include <bits/stdc++.h>

using namespace std;

int main(){
		int n;
		cin >> n;
		vector<int> a(n);
		for (int a_i = 0; a_i < n; a_i++) {
			cin >> a[a_i];
		}
		// your code goes here
		int smalldiff = abs(a[0] - a[1]);
		for (int i = 0; i < a.capacity(); i++)
		{
			for (int j = i; j < a.capacity(); j++)
			{
				if (abs(a[i] - a[j]) < smalldiff)
				{
					smalldiff = abs(a[i] - a[j]);
				}
			}
		}
		return smalldiff;
}