#include <bits/stdc++.h>
#include <cmath>

using namespace std;

int main(){
    int n;
    long long answer=99999;
    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());
    for(int x=0;x<n;x++){
        if(a[x]==a[x+1]){answer=0;break;}
    
        if(answer>abs(a[x]-a[x+1])&&answer!=0){answer=abs(a[x]-a[x+1]);}
    }
   cout<<answer;

    return 0;
    }