import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

import java.util.*;

class Result {

    /*
     * Complete the 'minimumLoss' function below.
     *
     * The function is expected to return an INTEGER.
     * The function accepts LONG_INTEGER_ARRAY price as parameter.
     */

    public static int minimumLoss(List<Long> price) {
        int n = price.size();
        long[] priceArray = new long[n];
        for (int i = 0; i < n; i++) {
            priceArray[i] = price.get(i);
        }

        // Create a map to store the original indices of prices
        Map<Long, Integer> indexMap = new HashMap<>();
        for (int i = 0; i < n; i++) {
            indexMap.put(priceArray[i], i);
        }

        // Sort the prices in descending order
        Arrays.sort(priceArray);

        long maxLoss = Long.MAX_VALUE;

        // Iterate through the sorted prices and find the maximum loss
        for (int i = 1; i < n; i++) {
            if (indexMap.get(priceArray[i]) < indexMap.get(priceArray[i - 1])) {
                maxLoss = Math.min(maxLoss, priceArray[i] - priceArray[i - 1]);
            }
        }

        return (int) maxLoss;
    }
}


public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int n = Integer.parseInt(bufferedReader.readLine().trim());

        List<Long> price = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
            .map(Long::parseLong)
            .collect(toList());

        int result = Result.minimumLoss(price);

        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();

        bufferedReader.close();
        bufferedWriter.close();
    }
}