#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <limits.h>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    vector<long long int> a;
	int N;
	cin >> N;
	for (int i = 0; i < N; i++) {
		long long int temp;
		cin >> temp;
		a.push_back(temp);
	}
	sort(a.begin(), a.end());
    long long int min = LLONG_MAX;
	for (int i = 0; i<N-1; i++)if(a[i+1]-a[i]<min)min=a[i+1]-a[i];
    cout<<min<<endl;
    return 0;
}