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

using namespace std;

int main()
{
    int n, x[100000];
    cin >> n;
    for(int i=0; i<n; i++) cin >> x[i];

    sort(x, x+n);

    int ans = 1000010;
    for(int i=0; i<n-1; i++){
        if(x[i+1] == x[i]) continue;
        ans = min(ans, x[i+1] - x[i]);
    }

    cout << (ans == 1000010 ? 0 : ans) << endl;

    return 0;
}