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


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