#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
using namespace std;
int main(){
    int n;cin>>n;
    vector<int> a(n);
    for(int i = 0; n > i; i++)cin>>a[i];
    sort(a.begin(),a.end());
    int ret = 123456789;
    for(int i = 1; n > i; i++){
        if(a[i]!=a[i-1])ret = min(ret,a[i]-a[i-1]);
    }
    cout << (ret == 123456789 ? 0 : ret) << endl;
}