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


int main() 
{
    long long int a[1000000],i,j,k,m,n;
    cin>>n;
    for(i=0;i<n;i++)
    {
        cin>>a[i];
       
    }    
    sort(a,a+n);

    
    k=1000000;
for (int i=0; i<n-1; i++)
      if (a[i+1] - a[i] < k)
          k = a[i+1] - a[i];
    cout<<k;
    return 0;
}