003

#include <iostream>

using namespace std;


int main()
{
	char* mas = new char[10000];
	int i = 0, sum = 0;
	for (int j = 0; j < 10000; j++)
	{
		mas[j] = 0;
	}
	cin.get(mas[0]);
	while (mas[i] != '\n')
	{
		i++;
		cin.get(mas[i]);
		sum++;
	}
	for (int i = 0; i < sum; i++)
	{
		if (mas[i] == ' ')
		{
			for (int j = i; j < sum; j++)
			{
				mas[j] = mas[j + 1];
			}
			i--;
			sum--;
		}
		if (mas[i] >= 'A' && mas[i] <= 'Z')
		{
			mas[i] += 32;
		}
	}
	for (int i = 0; i < sum; i++)
	{

		if (mas[i] != mas[sum - i - 1])
		{
			cout << "NO";
			delete[] mas;
			return 0;
		}
	}
	cout << "YES";
	delete[] mas;
	return 0;
}