#include<bits/stdc++.h>

using namespace std;

long long _abs(long long x){return (x < 0)? -x:x;}

long long arr[1000000];
int main(){
    int n;
    cin >> n;
    for(int i = 0; i < n; i++){
        cin >> arr[i];
    }
    long long m = INT_MAX;
    sort(arr,arr+n);
    for(int i = 1; i < n && m; i++){
        auto diff = abs(arr[i]-arr[i-1]);
        if(m > diff) m = diff;
    }
    cout << m << endl;
}