#include <cstdio>
#include <cstring>
#include <cstdlib> 
#include <algorithm>
 
using namespace std;

//namaega184


int main(){
	int n,x[100003];scanf("%d",&n);
	for(int i=0;i<n;i++)scanf("%d",&x[i]);
	sort(x,x+n);
	int ans=1000000001; 
	for(int i=1;i<n;i++)if(x[i]!=x[i-1])ans=min(ans,x[i]-x[i-1]);
	if(ans==1000000001)ans=0;
	printf("%d\n",ans); 
	return 0;
}