#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main()
{
int N;
cin >> N;
vector<int> a(N);
for(int i =0; i < N; i++){
cin >> a[i];
}
sort(a.begin(),a.end());
if(a[0] == a[N-1]){
cout << 0 << endl;
return 0;
}

int mini = 100000000;
for(int i = 0; i < N-1;i++){
if(a[i] == a[i+1]){
continue;
}
mini = min(mini, abs(a[i]-a[i+1]));
}
cout << mini << endl;
return 0;
}