#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    for(int i = 0; i < n; ++i){
       cin >> a[i];
    }
    sort(a.begin(), a.end());
    
    int min(a[1]-a[0]);
    for(int i = 2; i < n; ++i){
        if((a[i] - a[i-1])<min) min = a[i] - a[i-1];
        if(!min) break;
        
    }
    cout << min << endl;
    return 0;
}