#include <iostream>
#include <algorithm>
using namespace std;

int main(){
	int n;
	cin >> n;
	int x[n];
	for(int i=0;i<n;i++){
		cin >> x[i];
	}
	sort(x,x+n);
	if(x[n-1]==x[0]){cout << 0 << endl; return 0;}
	
	int min=x[n-1]-x[0];
	
	for(int i=1;i<n;i++){
		if(x[i]==x[i-1])continue;
		else{if(x[i]-x[i-1]<min)min=x[i]-x[i-1];}
	}
	cout << min << endl;

	return 0;
}