#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 smallest = 0x7fffffff;
    for (int i = 0; i < n-1; ++i) {
        int absolute = a[i] < a[i+1] ? a[i+1] - a[i] : a[i] - a[i+1];
        if (absolute < smallest) {
            smallest = absolute;
        }
    }
    cout << smallest;
    return 0;
}