#include <bits/stdc++.h>
using namespace std;


long long int difference(long long int arr[],long long int n)
{
	
	sort(arr, arr+n);

	
	long long int diff = INT_MAX;

	
	for (long long int i=0; i<n-1; i++){
		if (arr[i+1] - arr[i] < diff){
			diff = arr[i+1] - arr[i];}}


	return diff;
}


int main()
{
	
	long long int n, i;
	cin>>n;
	long long int arr[n];
	for(i=0;i<n;i++)
	{
		scanf("%lld", &arr[i]);
	}
	cout<<difference(arr, n)<<endl;
	return 0;
}