#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
// #include <atcoder/all>


using namespace std;
// using namespace atcoder;
#define rep(i,m,n,k) for (int i = (int)(m); i < (int)(n); i += (int)(k))
#define rrep(i,m,n,k) for (int i = (int)(m); i > (int)(n); i += (int)(k))
#define ll long long
#define list(T,A,N) vector<T> A(N);for(int i=0;i<(int)(N);i++){cin >> A[i];}
#define all(X) X.begin(),X.end()
template<typename T> inline bool chmin(T& a, T b){if(a > b){a = b; return true;} return false;}
template<typename T> inline bool chmax(T& a, T b){if(a < b){a = b; return true;} return false;}
template<typename T> map<T,int> Counter(vector<T> X){map<T,int> C;for(auto x:X){C[x]++;}; return C;}
constexpr ll INF = (1LL<<60);



int main(){
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int N;
    cin >> N;
    list(ll,X,N);
    sort(all(X));
    X.erase(unique(all(X)),X.end());
    N = (int)X.size();
    if (N==1){
        cout << 0 << endl;
        return 0;
    }
    ll ans = INF;
    rep(i,0,N-1,1){
        ans = min(ans,X[i+1]-X[i]);
    }
    cout << ans << endl;
    return 0;
}