#include <bits/stdc++.h>
#include <stdlib.h>

using namespace std;

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