#include <bits/stdc++.h> using namespace std; #define rep(i, n) for (int i = 0; i < (n); i++) typedef long long ll; typedef pair<int, int> pii; typedef vector<ll> vll; typedef vector<int> vi; typedef vector<vector<int>> vvi; typedef vector<vector<ll>> vvll; const ll inf = 1e16; const ll md = 1000000007; int main() { int n; cin>>n; set<int> xx; rep(i,n){ int x; cin>>x; xx.insert(x); } if(xx.size()==1){ puts("0"); return 0; } int ans=1000005; int px=-1; for(int x:xx){ if(px==-1){ px=x; continue; } ans=min(ans,x-px); px=x; } cout<<ans<<endl; return 0; }