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


int main() {
    int n,min,sub;
    cin>>n;
    int a[n];
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    sort(a,a+n);
    if(a[0]>a[1]){
        min=a[0]-a[1];
    }
    else{
        min=a[1]-a[0];
    }
    for(int i=1;i<n-1;i++){
        if(a[i]>a[i+1]){
            sub=a[i]-a[i+1];
        }
        else{
            sub=a[i+1]-a[i];
        }
        if(min>sub)min=sub;
    }
    /*
    if(a[0]>a[1]){
        min=a[0]-a[1];
    }
    else{
        min=a[1]-a[0];
    }
    for(int i=0;i<n-1;i++){
        for(int j=i+1;j<n;j++){
            if(a[i]>a[j]){
                sub=a[i]-a[j];
            }
            else {
                sub=a[j]-a[i];
            }
            if(sub<min)min=sub;
        }
    }
    */
    cout<<min;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}