import java.util.*;
import java.util.stream.Collectors;

public class ArrayStabilization {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        ArrayList<Integer> lists = new ArrayList<>();
        int inputs = sc.nextInt();
        for (int i = 0; i < inputs; i++) {
            lists.add(sc.nextInt());
        }

        HashSet<Integer> sets = new HashSet<>();
        ArrayList<Integer> a = new ArrayList<>(lists);
        IntSummaryStatistics intStream = a.stream().collect(Collectors.summarizingInt(Integer::intValue));
        int max = intStream.getMax();
        a.remove(new Integer(max));
        intStream = a.stream().collect(Collectors.summarizingInt(Integer::intValue));
        int max1 = intStream.getMax();
        int min1 = intStream.getMin();
        sets.add(max1 - min1);


        a = new ArrayList<>(lists);
        intStream = a.stream().collect(Collectors.summarizingInt(Integer::intValue));
        int minimum = intStream.getMin();
        a.remove(new Integer(minimum));
        intStream = a.stream().collect(Collectors.summarizingInt(Integer::intValue));
        max1 = intStream.getMax();
        min1 = intStream.getMin();
        sets.add(max1 - min1);

        Optional<Integer> min = sets.stream().min(Integer::compareTo);
        if (min.isPresent()) {
            System.out.println(min.get());
        } else {
            System.out.println(0);
        }
    }

}