#include <bits/stdc++.h>
#include <algorithm>
using namespace std;
int main(){
    ios_base::sync_with_stdio;
    int n,i,j,total;
    cin >> n;
    vector<int> a(n);
    for(i=0;i<n;i++)
       cin>>a[i];
    std::sort(a.begin(),a.end());
    total = 9999;
    for(i=1;i<n;i++)
        if(abs(a[i]-a[i-1])<total) 
            total = abs(a[i]-a[i-1]);
    cout<<total;
    return 0;
}