#include<iostream>
#include<climits>
#include<cstdlib>
using namespace std;
int main(){
    int n;
    cin >> n;
    int x[n];
    int d,d_max=INT_MAX;
    cin >> x[0];
    for(int i=1;i<n;i++){
        cin >> x[i];
        if(x[i]!=x[i-1])d = x[i]-x[i-1];
        if(d<0)d*=-1;
        d_max = min(d,d_max);
    }
    cout << d_max <<endl;
}