import java.util.Scanner;

public class MiddleCharacter {
    //Middle Characters
    //You will receive a single string. Write a method that prints the middle character. If the length of the string is even,
    //there are two middle characters.
    //Examples
    //Input
    //aString
    // Output:r
    //someText
    // Output: eT
    //3245
    // Output: 24
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String input=scanner.nextLine()
;
        System.out.println(middleCharacter(input));
    }
    static char middleCharacter(String input){
        char middle;
        char [] array;
        for (int i=0; i<=input.length()/2; i++){
            array[] = input.charAt(i);
        }
            if(input.length()%2==0){
                middle=array[array.length/2];
            }
            if(!(input.length()%2==0)){
                middle=array[0];
            }
        return middle;
    }
}