#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;


int main() {
    int i, n;
    
    cin >> n;
    
    long arr [n] = {};
    
    for(i = 0; i<n; ++i){
        cin >> arr[i];
    }
    
    sort(arr, arr+n);
    
    long minSum = abs(arr[0]-arr[1]);
    
    
    
    for(i = 1; i<n; ++i){
        long t = abs(arr[i] - arr[i+1]);
        if(t < minSum) minSum = t;
    }
    
    cout << minSum;
    return 0;
}