#include<iostream>
#include<string>
#include<vector>
#include<algorithm>

using namespace std;

int mod(int a)
{
    if(a >= 0){return a;}
    else{return -a;}
}

int main()
{
    int min;
    int n;
    cin >> n;
    vector<int> a(n);
    for(int a_i = 0; a_i < n; a_i++){cin >> a[a_i];}
    sort(a.begin(),a.end());
    
    min = mod(a[0] - a[1]);
    
    for(int i = 1;i<a.size()-1;i++)
    {
        if(mod(a[i]-a[i+1])< min)
        {
            min = mod(a[i]-a[i+1]);
        }
    }
    
    cout<<min;

}