#include <algorithm>
#include <iostream>
#include <fstream>
#include <cstdio>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <cmath>
#include <functional>
#include <cassert>
#include <iomanip>
#include <array>
#include <time.h>
#include <limits.h>
#include <numeric>
#define debug(x) cout<<#x<<": "<<x<<endl
#define rep(i,n) for (int i=0;i<(n);i++)
#define FOR(i,a,b) for (int i=(a);i<=(b);i++)
using namespace std;


void solve(){
#ifdef _WIN32
    istream &cin = ifstream("input.txt");
#endif
    int n;
    vector<int> v;
    cin >> n;
    if (n == 1){
    	cout << 0 << endl;
    	return;
    }
    rep(i, n){
    	int tmp;
    	cin >> tmp;
    	v.push_back(tmp);
    }
    sort(v.begin(), v.end());
    v.erase(unique(v.begin(), v.end()), v.end());
	if (v.size() == 1){
    	cout << 0 << endl;
    	return;
    }
	int ans = INT_MAX;
	rep(i, v.size() - 1){
		ans = min(ans, v[i + 1] - v[i]);
	}
	cout << ans << endl;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    solve();
    return 0;
}