use proconio::input;
use std::cmp::min;

fn main() {
	input! {
		n: usize,
		x: [isize; n],
	}

    let mut m = std::isize::MAX;

    for i in 0..n {
        for j in 0..n {
            if x[i] != x[j] {
                m = min(m, (x[i] - x[j]).abs());
            }
        }
    }

    let ans = if m == std::isize::MAX {
        0
    } else {
        m
    };

	println!("{ans}");
}