#include <iostream>
#include <iomanip>

#include <algorithm>
#include <math.h>

#include <string>
#include <list>
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

int main(void){
	cin.tie(0);
	ios::sync_with_stdio(false);
	cout << fixed;//
	//cout << setprecision(6);//

	int N;
	cin>>N;//[1,10^5]
	int x[(int)1e5];
	rep(i,N){
		cin>>x[i];
	}
	sort(x,x+N);
	
	int lmin = 0;
	int temp;
	rep(i,N-1){
		if(x[i] != x[i+1]){
			temp = x[i+1] - x[i];
			if(lmin == 0 || temp < lmin){
				lmin = temp;
			}
		}
	}
	P(lmin);
	return 0;
}