#include "bits/stdc++.h"

using namespace std;

int main(){
  int n;
  scanf("%d", &n);
  int nums[100005];
  for(int i=0; i<n; i++)
    scanf("%d", &nums[i]);
  sort(nums, nums+n);
  int minAbs = pow(2, 30);
  for(int i=1; i<n; i++)
    minAbs = min(minAbs, abs(nums[i]-nums[i-1]));
  printf("%d\n", minAbs);
  return 0;
}