#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];
    }
    
    sort(a.begin(),a.end());
    
    int minDifference = INT_MAX;
    
    for(size_t i=0 ; i<n-1 ; i++)
        minDifference = std::min(minDifference,std::abs(a[i]-a[i+1]));
    
    cout << minDifference;
    
    return 0;
}