#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin>>n;
    int arr[n];
    for(int i= 0; i<n ;i++){
        cin>>arr[i];
    }
    int diff, min;
    min= arr[0]-arr[1];
    for(int i= 0; i<n-1; i++){
        for(int j= i+1; j<n; j++){
            diff= arr[i]-arr[j];
            if(diff<0){
                diff= -diff;
            }
            if(min>diff){
                min= diff;
            }
        }
    }
    cout<<min;
    return 0;
}