#include <bits/stdc++.h>

using namespace std;

const int MAX_VAL = 2000000001;
int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    for(int i = 0; i < n; i++){
       cin >> a[i];
    }
    
    sort(a.begin(), a.end());
    
    int diff = MAX_VAL;
    for (int i = 1; i < a.size(); i++) {
        diff = min(diff, abs(a[i - 1] - a[i]));
    }
    
    cout << diff << endl;
    
    return 0;
}