#include <iostream>
using namespace std;

int main()
{
	long long a, b = 0;
	cin >> a;
	
	while (a > 0)
	{

		b += a % 10;
		a /= 10;//a = a / 10
		if(a!=0)
			b *= 10;
	}
	cout << b;
	return 0;

	//int a, b, c, count = 0;
	//
	//for ( a = 0; a <= 185 / 15; a++)
	//	for ( b = 0; b <= 185 / 17; b++)
	//		for ( c = 0; c <= 185 / 21; c++ )
	//			if ( 15 * a + 17 * b + 21 * c == 185)
	//			{
	//				printf("15 * %2d + 17 * %2d + 21 * %2d == 185\n", a, b, c);
	//				count++;
	//				//cout << "15 * " << a << " + 17 * " << b << " + 21 * " << c << " = 185\
	//			}
	//cout << count;
	//
	return 0;
}