#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> a(n), absDiffs(n-1,0);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    // sort the vector in ascending order
    sort(a.begin(),a.end());
    //populate an array of min absolute differences involving each number, then determine the minimum
    for(int i=0;i!=n-1;i++){
        if(i==0) absDiffs[i]=a[i+1]-a[i];
        else absDiffs[i]=min(abs(a[i]-a[i-1]),abs(a[i+1]-a[i]));
    }
    cout<<*min_element(absDiffs.begin(),absDiffs.end());
    
    return 0;
}