use std::io::*;
fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();
    let mut a: Vec<usize> = (0..n)
        .map(|_| itr.next().unwrap().parse().unwrap())
        .collect();
    a.sort();
    a.dedup();
    if a.len() < 2 {
        println!("0");
        return;
    }
    let mut ans = 1 << 30;
    for i in 0..a.len() - 1 {
        ans = std::cmp::min(ans, a[i + 1] - a[i]);
    }
    println!("{}", ans);
}