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


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