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#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
cin >> n;
int a[1000];
for (int i = 0; i < n; i++) {
cin >> a[i];
}
int m = INT32_MAX;
for (int i = 0; i < n - 1; i++) {
for (int j = i + 1; j < n; j++) {
if (abs(a[j] - a[i]) < m)m = abs(a[j] - a[i]);
}
}
cout << m << endl;
return 0;
}