#include <bits/stdc++.h>

using namespace std;

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