#include <bits/stdc++.h>
#define nmax 100005

using namespace std;

int v[nmax];
int main()
{
    int n;

    scanf("%d", &n);
    for(int i=1;i<=n;i++)
        scanf("%d", &v[i]);
    sort(v+1, v+n+1);
    int raspuns=abs(v[1]-v[2]);
    for(int i=2;i<n;i++)
    {
        if(raspuns>abs(v[i]-v[i+1]))
            raspuns=abs(v[i]-v[i+1]);
    }
    printf("%d\n", raspuns);

    return 0;
}