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

int main(){
	int n;
	cin >> n;
	int a[n];
	for(int i = 0; i < n; i++){
		cin >> a[i];
	}
	sort(a, a + n);
	int x = 1000001;
	for(int i = 0; i < n - 1; i++){
		if(a[i + 1] != a[i]){
			x = min(x, a[i + 1] - a[i]);
		}
	}
	if(x == 1000001) x = 0;
	cout<< x <<endl;
}