import kotlin.math.*

fun main()
{
    val N = readLine()!!.toInt()
    val X = readLine()!!.split(" ").map(String::toInt).sorted()

    var mi = 0
    for (i in 1..N-1) {
        if (X[i] == X[i-1]) {
            continue
        }
        val d = abs(X[i] - X[i-1])
        if (mi == 0 || d < mi) {
            mi = d
        }
    }
    println(mi)
}