#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> a(n),min_st;
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    sort(a.begin(),a.end());
    int diff=abs(a[1]-a[0]);
    for(int i=0;i<n-1;i++){
        if(abs(a[i]-a[i+1])<diff)diff = abs(a[i]-a[i+1]);
    }
    cout << diff <<endl;
    return 0;
}