#include <bits/stdc++.h>
using namespace std;
int main(){
    int n; cin >> n;
    std::vector<int> v(n);
    int minx = 1000001;
    for(int i=0; i < n; i++) cin >> v[i];
    sort(v.begin(), v.end());
    for(int i=0; i < n - 1; i++){
        if(v[i] == v[i+1] ) continue;
        minx = min(abs(v[i] - v[i+1]), minx);
    }
    
    if(minx == 1000001) cout << 0 << endl;
    else cout << minx << endl;
}