#include <bits/stdc++.h>

using namespace std;
int abso( int a);
int main(){
    int n;
    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());
    int minDiff = abso( a[1] - a[0]);
    for(int a_i = 1; a_i < n; a_i++){
       int diff = abso( a[a_i] - a[a_i + 1]);
       if( diff < minDiff){
           minDiff = diff;
       }
    }
    // your code goes here
    cout<< minDiff;
    return 0;
}
int abso( int a){
    return a>0?a:-a;
}