import java.util.Scanner;

public class FlipGame {

	/*
	 * 翻轉游戲 列舉
	 */
	public static boolean isFinish(int[][] fields) {
		// 判斷是否完成
		int flag_color = 0;
		for (int i = 0; i < fields.length; i++) {
			for (int j = 0; j < fields[0].length; j++) {
				if (i == 0 && j == 0) {
					flag_color = fields[i][j];
					continue;
				}

				if (fields[i][j] != flag_color) {
					return false;
				}
			}
		}
		return true;

	}

	public static void flip(int[][] fields, int index) {

		// 翻轉
		int i = (index - 1) / fields.length;
		int j = (index - 1) % fields.length;
		fields[i][j] = fields[i][j] & 2;

		if (i > 0)
			fields[i - 1][j] = (fields[i - 1][j] + 1) % 2;

		if (j > 0)
			fields[i][j - 1] = (fields[i][j - 1] + 1) % 2;

		if (i < 3)
			fields[i + 1][j] = (fields[i + 1][j] + 1) % 2;

		if (j < 3)
			fields[i][j + 1] = (fields[i][j + 1] + 1) % 2;

	}

	public static boolean combine_recut(int[] arr, int start, int[] result, int index, int NUM, int arr_len,
			int[][] fields) {

		for (int i = start; i < arr_len - (NUM - index) + 1; i++) {
			result[index] = i;
			if (index == NUM - 1) {
				int[][] tmp_f = new int[4][4];
				for (int j = 0; j < fields.length; j++) {
					tmp_f[j] = fields[j].clone();
				}

				for (int j = 0; j < NUM; j++) {
					System.out.print(arr[result[j]] + "\t");
					// 翻轉棋子
					flip(tmp_f, arr[result[j]]);
				}	

				if (isFinish(tmp_f)) {
					System.out.println("success");
					return true;
				}

				System.out.print("\n");
			} else {
				if (combine_recut(arr, i + 1, result, index + 1, NUM, arr_len, fields))
					return true;
			}
		}
		return false;
	}

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		int[][] fields = new int[4][4];
		int lines = -1;
		String line = null;
		while (++lines < 4) {
			line = input.nextLine().trim();;
			char[] ar = line.toCharArray();
			for (int i = 0; i < ar.length; i++) {
				fields[lines][i] = ar[i] == 'b' ? 1 : 0;
			}
		}

		if (isFinish(fields)) {
			System.out.println(0);
			return;
		}
		int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };

		for (int i = 3; i <= arr.length; i++) {
			System.out.println("--------------------------------------------------------------------");
			System.out.println("count  :  " + i);
			int[] result = new int[i];

			if (combine_recut(arr, 0, result, 0, i, arr.length, fields)) {
				System.out.println(i);
				return;
			}
		}
		System.out.println("Impossible");
	}

}