import java.io.*;
class Main
{
    public static void main(String args[])throws IOException
    {
	BufferedReader input=new BufferedReader(new InputStreamReader(System.in));
	String str=input.readLine();
	int m=0,n=str.length()-1;
	char ch[]=str.toCharArray();
	String str1;
	while(true)
	    {
		
		if((m==n) || (m>n))
		    {
			str1=String.valueOf(ch);
			break;
		    }
		
		
		char tmp=ch[m];
		ch[m]=ch[n];
		ch[n]=tmp;
		m++;
		n--;

	    }
	
		System.out.println(str1);
	    
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz