#include <stdio.h>
#include <math.h>

#include <iostream>
#include <vector>
#include <algorithm>

int main() {

  int i;

  std::vector<int> v;
  int n;
  int temp;
  int ans = 10000000;
  
  std::cin >> n;
  for(i = 0; i < n; i++) {
    std::cin >> temp;
    v.push_back(temp);
  }

  if( n == 1 ) {
    std::cout << "0" << std::endl;
    return 0;
  }

  std::sort(v.begin(), v.end());
  
  for(i = 0; i < n-1; i++) {
    if( v[i] ==  v[i+1] ) {
      continue;
    }
    if( ans > (v[i+1] - v[i]) ) {
      ans = (v[i+1] - v[i]);
    }
  }

  if( ans == 10000000 ) {
    ans = 0;
  }

  std::cout << ans << std::endl;

  return 0;
}