#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
using namespace std;

int main(){
    unsigned long long n;
    cin>>n;
    vector<long long> list;
    long long a;
    for(long long i=0;i<n;i++){
        cin>>a;
        list.push_back(a);
    }
    sort(list.begin(),list.end());
    long long min=abs(list[0]-list[1]);
    long long diff;
    for(int i=0;i<n-1;i++){
        diff = abs(list[i]-list[i+1]);
        if(diff<min)min=diff;
    }
    cout<<min;
    //we have the numbers now
}