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


int main() {
    int n;
    cin >> n;
    long arr[n];
    for(int i=0;i<n;++i) cin >> arr[i];
    sort(arr,arr+n);
    long long min= 10000000000;
    for(int i=0;i<n-1;++i){
        if(abs(arr[i]-arr[i+1])<min) min = abs(arr[i]-arr[i+1]);
    }
    cout << min << endl;
    return 0;
}