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

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    int s[n];
    for (int i=0;i<n;i++)
        {
        cin>>s[i];
        if (s[i]<s[i-1])
            {
            s[i]=s[i]+s[i-1];
            s[i-1]=s[i]-s[i-1];
            s[i]=s[i]-s[i-1];
        }
    }
    //for (int i=0;i<n;i++)
  //  cout <<s[i]<<endl;
	
       int d= s[1]-s[0];
        for (int i=1;i<n;i++)
            {
            if (d<0)
                d= (-d);
            if (d>s[i+1]-s[i]||(d)>s[i]-s[i+1])
                d=s[i+1]-s[i];
        }
    if (d>0)
        cout <<d;
    else cout <<(-d);
    
    return 0;
}