#include <bits/stdc++.h>
using namespace std;

int main(){
int n,diff=INT_MAX,i;
cin>>n;
int arr[n];

for(i=0;i<n;i++)
    cin>>arr[i];

    sort(arr,arr+n);


for(i=0;i<n-1;i++){
    if(arr[i+1]-arr[i]<diff)
        diff=arr[i+1]-arr[i];
    }

    cout<<diff<<endl;

}