#include <iostream>
#include <algorithm>
#include <stdlib.h>
using namespace std;

int main() {
  int n, min_distance = 10000000;
  cin >> n;
  int x[n];
  for (int i = 0; i < n; i++) {
    cin >> x[i];
  }

  sort(x, x + n);

  if (x[0] == x[n]) {
    min_distance = 0;
  }
  else {
    for (int i = 0; i < n - 1; i++) {
      if (min_distance > abs(x[i] - x[i + 1]) && x[i] != x[i + 1]) {
        min_distance = abs(x[i] - x[i + 1]);
      }
    }
  }

  cout << min_distance << endl;

  return 0;
}