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


int main() {
    int n;
    cin >>n;
    int a[n];
    for (int i=0; i<n; i++)
        cin >>a[i];
    
    sort (a,a+n);
    
    int d[n-1];
    for (int i=0; i<n-1; i++)
        {
                d[i]=abs(a[i+1]-a[i]);
        
    }
    sort (d,d+n-1);
    
    cout <<d[0];
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}