#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    int diff,min;
    cin >> n;
    vector<int> a(n);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    min=a[0]-a[1];
    for(int i=0;i<n-1;i++)
    {
        for(int j=i+1;j<n;j++)
        {
            diff = a[j]-a[i];
            if(diff < 0)
                diff = diff*(-1);
            
            if(diff<min)
                min=diff;
        }
    }
    cout<<min;
    // your code goes here
    return 0;
}