import java.util.*;

class Y135{
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int ans=2000000000;
        if(n==1){
            ans=1;
        }
        int[] x=new int[n];
        for(int i=0;i<n;i++){
            x[i]=sc.nextInt();
        }
        Arrays.sort(x);
        for(int i=0;i<n-1;i++){
            if(x[i]!=x[i+1]){
                ans=Math.min(ans,x[i+1]-x[i]);
            }
        }
        if(ans==2000000000){
            ans=0;
        }
        System.out.println(ans);
    }
}
/*
class Y135{
    public static void main(String arg[]){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int[] x=new int[n];
        for(int i=0;i<n;i++){
            x[i]=sc.nextInt();
        }
        int min=2000000000;
        for(int i=0;i<n-1;i++){
            for(int j=i;j<n;j++){
                if(Math.abs(x[i]-x[j])!=0&&Math.abs(x[i]-x[j])<min){
                    min=Math.abs(x[i]-x[j]);
                }
            }
        }
        System.out.println(min);
    }
}
*/