#include <bits/stdc++.h>
using namespace std;

int main()
{
	int N;
	cin >> N;
	vector<int> X( N );
	for( int i = 0; i < N; i++ ) {
		cin >> X[i];
	}

	sort( X.begin(), X.end() );
	int ans = INT32_MAX;
	for( int i = 1; i < N; i++ ) {
		int d = abs( X[i] - X[i - 1] );
		if( d ) ans = min( ans, d );
	}
	if( ans == INT32_MAX ) ans = 0;

	cout << ans << endl;
}