#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 */   
    long long n;
    cin>>n;
    long long a[100000];
    long long b[100000],c[100000];
    for(int i=0;i<n;i++)
        {
          cin>>a[i];
    }
    sort (a,a+n);
    long long k,diff=abs(a[0]-a[1]);
    for(int i=1;i<n-1;i++)
        {
          k=abs(a[i]-a[i+1]);
        if(k<diff)
            diff=k;
    }
    k=abs(a[0]-a[n-1]);
    if(k<diff)
            diff=k;
   cout<<diff;
    
    
    return 0;
}