#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>
using namespace std;


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

typedef long long ll;
typedef unsigned long long ull;
typedef long double lb;
/* ここからが本編 */


int main(void)
{
   int i,j,k,l;
   int n;
   static int x[100000];
   int dif = 10000000;
   cin >> n;

   for(i=0;i<n;i++) cin >> x[i];
   sort(x,x+n);
   for(i=1;i<n;i++) {
      if( x[i]-x[i-1] < dif && x[i]-x[i-1]) {
         dif = x[i]-x[i-1];
      }
   }
   if(dif == 10000000) cout << "0\n";
   else cout << dif << endl;
   return 0;
}