#include <fstream>

using namespace std;
int v[10001];
int main()
{
    ifstream fin ("input");
    ofstream fout ("output");
    int n, dif_minim = 999999;
    fin >> n;
    for (int i = 1; i<=n; ++i)
        fin >> v[i];
    for (int i = 1; i<=n; ++i)
        for (int j = i+1; j<=n; ++j)
            if (v[i] < v[j])
                dif_minim = min (dif_minim, v[j]-v[i]);
            else dif_minim = min (dif_minim, v[i]-v[j]);
    fout << dif_minim;
    return 0;
}