#include<iostream>
#include<algorithm>
#include<stdio.h>
#include<stdlib.h>
#include<vector>
#include<string>
#include<sstream>
#include<math.h>
using namespace std;


int main(){

  int n;
  cin >> n;

  vector<int> x(n);
  for(int i=0; i<n; i++) cin >> x[i];

  sort(x.begin(), x.end());

  int ans = 10000000;
  for(int i=0; i<n-1; i++){
    if( x[i+1] == x[i] ) continue;
    if( ans > x[i+1]-x[i] ){
      ans = x[i+1]-x[i];
    }
  }
  if( ans == 10000000 ) cout << 0 << endl;
  else cout << ans << endl;

  return 0;
}