#include <iostream>
#include <algorithm>
#include <climits>
#include <math.h>
using namespace std;
int main(void){
    // Your code here!
    
    int n;
    cin >> n;
    int a,b,min = INT_MAX;
    cin >> a;
    for(int i = 0; i < (n - 1); i++) {
        cin >> b;
        if(a==b)continue;
        if(min > abs(a - b)) min = abs(a - b);
        a = b;
    }
    
    cout << min;
    
    
}