#include <stdio.h>

#define F(i,n) for(int i = 0;i < n;i++)
#define N 1000001

void z(int a[],int n,int min,int max){int s = a[(min+max)/2];int min2=min; int max2=max;int tmp;for(;;){for(;;){if(a[min2]>=s)break;min2++;}for(;;){if(a[max2]<=s)break;max2--;}if(min2>=max2)break;tmp=a[min2];a[min2]=a[max2];a[max2]=tmp;min2++;max2--;}if(min<min2-1) z(a,n,min,min2-1);if(max>max2+1) z(a,n,max2+1,max);}

int main(void){
	int n,t,r=N;
	scanf("%d",&n);
	int a[n];
	F(i,n)scanf("%d",&a[i]);
	z(a,n,0,n);
	F(i,n){
		//if(i==n-1)break;
		t=a[i]-a[i+1];
		if(t!=0){
			if(t<0)t*=-1;
			if(r>t){
				r=t;
			}
		}
	}
	if(r==N)r=0;
	printf("%d",r);
	return 0;
}