#include<iostream>
#include<stdlib.h>
#include<algorithm>
#include<climits>
using namespace std;
int main()
{
	int n;
	cin>>n;
	int b[n];
	for(int i=0;i<n;i++)
		cin>>b[i];
	sort(b,b+n);
	int min=INT_MAX;
	for (int i=0; i<n-1; i++)
      if (b[i+1] - b[i] < min)
          min = b[i+1] - b[i];
	cout<<min<<endl;
    return 0;
}