#include <bits/stdc++.h>

using namespace std;

#define REP(i,a,b) for(int i=a;i<(int)b;i++)
#define rep(i,n) REP(i,0,n)

int main() {
  
  int N; cin >> N;
  int arr[N];
  rep(i, N) {
    cin >> arr[i];
  }
  sort(arr, arr+N);
  
  int mn = 1<<29;
  rep(i, N-1) {
    if(arr[i] == arr[i+1]) continue;
    mn = min(mn, arr[i+1]-arr[i]);
  }
  if(mn == 1<<29) cout << 0 << endl;
  else  cout <<mn << endl;

  
  return 0;
}