#include<iostream>
using namespace std;
int main(){
    int n;
    cin >>n;
    if(n < 0)
        n = 0-n;
    else
    {
    	if(n == 0)
		{
        	cout << 0;
        	return 0;
   		}
    	while(1==1)
		{
        	if(n <= 0)
          	    break;
       	 cout << n%10;
       	 n /= 10;
    	}
	}
    return 0;
}