import java.util.Scanner;

/*
 * Recognizes words of a and b, with ñ in center
 */

public class Palindrom {
	
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		Stack<Character> st = new Stack<Character>();
		String input = sc.nextLine();
		char ch = '0';
		int i = 0;
		while(i < input.length() && (ch = input.charAt(i)) == 'a' || ch == 'b') {
			st.push(ch);
			i++;
		}
		if(i == input.length() || ch != 'c')
			System.out.println("Word not recognized");
		else if(ch == 'c') { // continue recognizing
			i++;
			try {
				while(i < input.length() && (ch = input.charAt(i)) == 'a' || ch == 'b') {
					if(ch != st.pop()) {
						System.out.println("Word not recognized");
						return;
					}
					i++;
				}
			}
			catch(EmptyStackException e) {
				System.out.println("Word not recognized");
				return;
			}
			if(i == input.length() && st.empty())
				System.out.println("Word recognized");
			else
				System.out.println("Word not recognized");
		}
	}

}