#include<bits/stdc++.h>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int n;
    cin>>n;
    vector<int> v;
    for(int i=0;i<n;i++){
        int a;
        cin>>a;
        v.push_back(a);
    }
    sort(v.begin(),v.end());
    int ans=INT_MAX;
    for(int i=1;i<v.size();i++){
        ans=min(ans,abs(v[i]-v[i-1]));
    }
    cout<<ans<<endl;
    return 0;
}