import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String string = sc.nextLine();
		char[] str_char = new char[3];
		for (int i = 0; i < 3; i++) {
			str_char[i] = string.charAt(i);
		}

		if (str_char[1] == 'B') {
			str_char[1] = 'R';
		} else {
			str_char[1] = 'B';
		}

		System.out.println(str_char);
	}
}
/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