#include <vector>
#include <iostream>
#include <iterator>
#include <algorithm>

#include<cstdio>
#include<algorithm>
#define min(x,y)(x<y?x:y)
using namespace std;
#define min(x,y)(x<y?x:y)
int main()
{long int a[100000],n,i,min1=0,min2=0;
scanf("%ld",&n);
for(i=0;i<n;i++)scanf("%ld",&a[i]);
sort(a,a+n);
min2=abs(a[1]-a[0]);
for(i=2;i<n;i++)
{   min1=abs(a[i]-a[i-1]);
	min2=min(min2,min1);
}
printf("%ld\n",min2);
	return 0;
}