#include <bits/stdc++.h>

using namespace std;
void minSum(vector<int> a, int n){
    sort(a.begin(), a.end() );
    
    int val = INT_MAX;
    for(int i=1; i<n; i++){

        int diff = abs(a[i]- a[i-1]);
        val= min(diff, val);

    }
    cout<<val<<endl;
}

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
    minSum(a, n);
    return 0;
}