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

int compare(const void*a, const void*b)
{
  return(*(int*)a-*(int*)b);
}
int main() {
long long int n;
cin >> n;
int array[n];
for(int i=0;i<n;i++)
{
    cin >> array[i];
}
qsort(array,n,sizeof(int),compare);
int answer=array[1]-array[0];
for(int i=2;i<n;i++)
{
  if((array[i]-array[i-1])<answer) answer=(array[i]-array[i-1]);
}
cout<< abs(answer);
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}