#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

int main() {
    
    int ans = INT_MAX;
    int N;
    cin >> N;
    vector<double> X(N);
    
    for ( int i = 0; i < N; i++ ) {
        cin >> X[i];
    }
    
    sort( X.begin(), X.end() );
    
    for ( int i = 0; i < N-1; i++ ) {
        if ( X[i] == X[i+1] ) { continue; }
        int dist = X[i+1] - X[i];
        ans = min( ans, dist );
    }
    
    if ( ans == INT_MAX ) { cout << 0 << endl; }
    else { cout << ans << endl; }
    
    return 0;
}