Problem:
Score : 200 points

Problem Statement

Print all the integers that satisfies the following in ascending order:

Among the integers between A and B (inclusive), it is either within the K smallest integers or within the K largest integers.

Constraints

1 \leq A \leq B \leq 10^9

1 \leq K \leq 100

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B K

Output

Print all the integers that satisfies the condition above in ascending order.

Sample Input 1

3 8 2

Sample Output 1

3
4
7
8

3 is the first smallest integer among the integers between 3 and 8.

4 is the second smallest integer among the integers between 3 and 8.

7 is the second largest integer among the integers between 3 and 8.

8 is the first largest integer among the integers between 3 and 8.

Sample Input 2

4 8 3

Sample Output 2

4
5
6
7
8

Sample Input 3

2 9 100

Sample Output 3

2
3
4
5
6
7
8
9

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static System.Math;

namespace AtCoderProject
{
    class Program
    {
        static void Main(string[] args)
        {
            var input = ReadLineIntArray();
            int A = input[0];
            int B = input[1];
            int K = input[2];

            int maxOutputNum = B - A + 1;
            if (2 * K >= maxOutputNum)
            {
                for (int i = A; i <= B; i++)
                    Console.WriteLine(i);
                return;
            }


            for (int i = 0; i < K; i++)
                Console.WriteLine(A + i);


            for (int i = K - 1; i >= 0; i--)
                Console.WriteLine(B - i);

            //Console.WriteLine(res);
        }


        #region READER
        static int ReadLineInt() => int.Parse(Console.ReadLine());
        static int[] ReadLineIntArray() => Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();

        static IEnumerable<string> ReadInputEnumruble(int count = int.MaxValue)
        {
            for (int i = 0; i < count; i++)
            {
                yield return Console.ReadLine();
            }
        }
        static int[] ReadInputInt(int count = int.MaxValue)
        {
            return ReadInputEnumruble(count).Select(s => int.Parse(s)).ToArray();
        }
        #endregion
    }
}