#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main()
{
  long long n,min,i,diff;
  int t,m;
   cin>>n;
   
   long long a[n];
   
    for(i=0;i<n;i++)
      cin>>a[i];
    
    
    
    sort(a,a+n);
    
    i=0;
    min=abs(a[0]);
    while(i<n)
     {
        t=abs(a[i]);
        m=abs(a[i+1]);
        diff=abs(t-m);
         
        if(diff<min)
          min=diff;
          
        i++;
        
       }
    cout<<min<<endl;
    
    
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}