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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int nums;
    std::cin >> nums;
    std::vector<int> vals;
    for(int i = 0; i < nums; ++i)
    {
        int q;
        std::cin >> q;
        vals.push_back(q);
    }
    std::sort(vals.begin(), vals.end());
    int abs_diff = std::numeric_limits<int>::max();
    for(int i = 0; i < vals.size() - 1; ++i)
    {
        abs_diff = std::min(abs_diff, std::abs(vals[i + 1] - vals[i]));
    }
    std::cout << abs_diff << '\n';
    
    return 0;
}