#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 min_diff = numeric_limits<int>::max();
    
    for (int i=0; i < n-1; ++i)
        min_diff = min(min_diff, a[i+1]-a[i]);
    
    cout << min_diff;
    
    return 0;
}