using System;

public class Program
{
	public static void Main()
	{
		int[] a = {4,15,35,8};
		//int[] a = {4,19,35,43};
		string input = "The quick brown fox jumps over the lazy dog.";
		Console.WriteLine(GivenTask(input, a));

	}

	public static string GivenTask(string input, int[] boltIndexes)
	{
		string answer = null;

		bool didItStart = false;
		int count = 0;

		for(int i = 1; i < boltIndexes.Length; i=i+2)
		{
			boltIndexes[i] = boltIndexes[i] + boltIndexes[i-1];
		}

		for(int i = 0; i < input.Length; i++)
		{
			if(boltIndexes[count] == i)
			{
				if(didItStart)
				{
					answer = answer + "</b>";
					didItStart = false;
					count++;
				}
				else
				{
					answer = answer + "<b>";
					didItStart = true;
					count++;
				}
			}
			answer = answer + input[i];
		}

		return answer;
	}
}