#include <bits/stdc++.h>
#include<math.h>
#include<stdlib.h>
using namespace std;

int main(){
    int diff=1000000000;
    int n;
    cin>>n;
    int a[n];
    int i=0;
    for(i=0;i<n;i++)
        cin>>a[i];
    sort(a,a+n);
    for(i=0;i<n-1;i++)
        {
        if(abs(a[i]-a[i+1])<diff)
            diff=abs(a[i]-a[i+1]);
    }
          
    
cout<<diff;
    
    
    
    
    return 0;
}