#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    sort(a.begin(), a.end());
    int minDiff = abs(a[0] - a[1]);
    for(int i = 1; i < n - 1; ++i){
        int currDiff = abs(a[i] - a[i+1]);
        if((currDiff) < minDiff) minDiff = currDiff;
    }
    cout << minDiff;
    return 0;
}