#include<iostream>
#include<iomanip>
#include<cmath>
#include<string>
#include<algorithm>
#include<vector>
#include<math.h>
#include<stack>
using namespace std;
int main(){
    int N; cin >> N;
    int x = 0; int minV = 10000000;
    vector<int> v;
    for(int i = 0; i < N; i++){
        cin >> x;
        v.push_back(x);
    }
    sort(v.begin(), v.end());
    for(int i = N-1; i >= 1; i--){
        if(v[i] != v[i-1]){
        minV = min(minV, v[i] - v[i-1]);
        }
    }
    if(minV == 10000000) minV = 0;
    cout << minV << endl;
    return 0;
}