#include <iostream>
#include <string>
#include <algorithm>
#include <vector>

using namespace std;

int main()
{
	int N;
	cin >> N;
	if( N == 1 ) { cout << 0 << endl; return 0; }

	vector<int> seq(N);
	for( int i = 0; i < N ; i++ ) {
		cin >> seq[i];
	}
	sort( seq.begin(), seq.end() );

	int l, r, m;
	m = 1000000+1;
	l = seq[0];
	bool ok = false ;
	for( int i = 1; i < N; i++ ) {
		r = seq[i];
		if( r - l != 0 ) {
			ok = true;
			m = min( r - l , m );
		}
		l = r;
	}
	if( ok ) {
		cout << m << endl;
	}
	else {
		cout << 0 << endl;
	}

	
	return 0;
}