#include<iostream>
#include<stdio.h>
#include<vector>
#include<algorithm>

using namespace std;

int main(){

    int n;
    cin>> n;

    vector<int> x(n);
    for(int i=0; i<n; i++){
        cin>> x[i];
    }

    sort(x.begin(), x.end());

    int d = 100000000;
    bool flag = false;
    for(int i=1; i<n; i++){
        if(x[i]-x[i-1]<d && x[i]!=x[i-1]){
            d = x[i]-x[i-1];
            flag = true;
        }
    }

    if(flag){
        cout<< d<< endl;
    }else{
        cout<< "0"<< endl;
    }
    return 0;
}