#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    vector<long> a(n);
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    sort(a.begin(),a.end());
    int diff=a[n-1];
    int temp;
    for(int i=0;i<n;i++){
        int j=i+1;
        temp=abs(a[j]-a[i]);
        if(temp<diff){
            diff=temp;
        }
    }
    cout<<diff;
    return 0;
}