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


int main() 
{
    int n,i;
    cin>>n;
    vector<int> arr(n);
        for( i=0;i<n;i++)
        cin>>arr[i];
    sort(arr.begin() ,arr.end());
    int diff=999999999;
    for ( i=0; i<n-1; i++)
      if (arr[i+1] - arr[i] < diff)
          diff = arr[i+1] - arr[i];
        cout<<diff;
    return 0;
}