#include<bits/stdc++.h>
#define rep(i,a,n) for (int i = a;i < n;i++)
#define per(i,n,a) for (int i = n-1;i >= a;i--)
using namespace std;

int main() {
    int n,tmp; cin >> n;
    vector<int> x(n);
    rep(i,0,n){
        cin >> x[i];
    }
    sort(x.begin(),x.end());
    int ans = 1<<30;
    rep(i,0,n-1) {
        if(x[i] == x[i+1]) continue;
        ans = min(ans,x[i + 1] - x[i]);
    }
    if(ans == (1 << 30)) ans = 0;
    cout << ans << endl;
}