#include <iostream>
#include <algorithm>
using namespace std;

#define lli long long int

int main()
{
	lli n,i,diff, mini=10000000000;
	cin >> n;
	lli A[n];
	for (i=0 ; i<n; i++)
	{
		cin >> A[i];
	}
	sort (A, A+n);
	for (i=0; i<n-1; i++)
	{
		diff = A[i+1] - A[i];
		if (diff < mini)
			mini = diff;
	}
	cout << mini << endl;
	return 0;
}