#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    // your code goes here
    
    std::sort(a.begin(), a.begin()+n);
    
    int min = 10*10*10;
    int diff = 0;
    
    for(int i = 1; i < n; i++) {
        diff = a[i] - a[i-1];
        if(diff < 0)
            diff = diff * -1;
        
        if(diff < min) 
            min = diff;
    }
    
    cout << min << endl;
    
    return 0;
}