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

using namespace std;

int main()
{
    int n, x;
    cin >> n;

    int d = 1000010, tmp = -1000010;
    for(int i=0; i<n; i++){
        cin >> x;
        if(tmp != x) d = min(d, abs(x - tmp));
        tmp = x;
    }

    cout << d << endl;

    return 0;
}