#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
#define rep(i, n) for(ll (i) = 0; (i) < (n); (i)++)
#define rep1(i, n) for(ll (i) = 1; (i) <= (n); (i)++)
#define rrep(i, n) for(ll (i) = (n) - 1; (i) >= 0; (i)--)
#define rrep1(i, n) for(ll (i) = (n); (i) >= 1; (i)--)
const ll INF = 1145141919;
const ll MOD = 1000000007;
template<class T> void chmax(T &a, const T &b){if(a < b){a = b;}}
template<class T> void chmin(T &a, const T &b){if(a > b){a = b;}}

int main(){

    ll N;
    cin >> N;
    vector<ll>v(N);
    rep(i, N)cin >> v[i];
    ll ans = INF;
    sort(v.begin(), v.end());
    for(ll i = 1; i < N; i++){
        if(v[i - 1] < v[i])chmin(ans, v[i] - v[i - 1]);
    }

    if(ans == INF)cout << 0 << endl;
    else cout << ans << endl;

    return 0;
}