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

int a[1000000];
int main() {
    int n,i;
    cin >> n;
    for(i=1;i<=n;i++) cin >> a[i];
    sort(a+1,a+n+1);
    int b=2e9;
    for(i=1;i<n;i++){
        if(b>a[i+1]-a[i]) b=a[i+1]-a[i];
    }
    cout<<b;
    return 0;
}