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

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    for(int i = 0; i < n; i++){
       cin >> a[i];
    }
    sort (a.begin(), a.begin()+a.size());
    int min = numeric_limits<int>::max();
    for(int x=1;x<n;x++){
    int num1 = a[x-1];
    int num2 = a[x];
    int diff = abs(num2-num1);
        if(diff<min)
            min=diff;
        if(min==0){
            cout<<0;
            return 0;
        }
    }
    cout<<min;
    return 0;
}