#include <bits/stdc++.h>
#include <vector>
#include <algorithm>

using namespace std;

int main(){
    long int n;
    cin >> n;
    vector<long int> a(n);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    sort(a.begin(),a.end());
    long int diff=abs(a[0]-a[1]);
    for(int i=1;i<n-1;i++)
        if(diff>abs(a[i]-a[i+1]))
        diff=abs(a[i]-a[i+1]);
        cout<<diff;
    // your code goes here
    return 0;
}