#include<iostream>
#include<algorithm>
using namespace std;
int main(){
    long int n;
    cin >> n;
    int arr[n];
    for(long int x=0;x<n;x++){
        cin >> arr[x];
        
    }
    long int min;
    sort(arr,arr+n);
        min=arr[1]-arr[0];
   
    for(long int x=1;x<n-1;x++){
       if(min>arr[x+1]-arr[x]){
           min=arr[x+1]-arr[x];
       }
    }
    cout << min << endl;
}