import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[][] c = new int[3][3];
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				c[i][j] = scan.nextInt();
			}
		}
		boolean F = false;
		int A = 0;
		int B = 0;
		int C = 0;
		A = c[0][0]+c[1][0]+c[2][0];
		B = c[0][1]+c[1][1]+c[2][1];
		C = c[0][2]+c[1][2]+c[2][2];
		for (int i = 0; i < 4; i++) {
			if ((A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0) {
				F = true;
			}
		}
		if (F) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[][] c = new int[3][3];
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				c[i][j] = scan.nextInt();
			}
		}
		boolean F = false;
		int A = 0;
		int B = 0;
		int C = 0;
		A = c[0][0]+c[1][0]+c[2][0];
		B = c[0][1]+c[1][1]+c[2][1];
		C = c[0][2]+c[1][2]+c[2][2];
		for (int i = 0; i < 4; i++) {
			if ((A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0) {
				F = true;
			}
		}
		if (F) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[][] c = new int[3][3];
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				c[i][j] = scan.nextInt();
			}
		}
		boolean F = false;
		int A = 0;
		int B = 0;
		int C = 0;
		A = c[0][0]+c[1][0]+c[2][0];
		B = c[0][1]+c[1][1]+c[2][1];
		C = c[0][2]+c[1][2]+c[2][2];
		for (int i = 0; i < 4; i++) {
			if ((A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0) {
				F = true;
			}
		}
		if (F) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	} main {
		Scanner scan = new Scanner(System.in);
		int[][] c = new int[3][3];
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				c[i][j] = scan.nextInt();
			}
		}
		boolean F = false;
		int A = 0;
		int B = 0;
		int C = 0;
		A = c[0][0]+c[1][0]+c[2][0];
		B = c[0][1]+c[1][1]+c[2][1];
		C = c[0][2]+c[1][2]+c[2][2];
		for (int i = 0; i < 4; i++) {
			if ((A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0) {
				F = true;
			}
		}
		if (F) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int[][] c = new int[3][3]; c new int[3][3] 3 3 for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				c[i][j] = scan.nextInt();
			}
		} int i = 0; int i = 0; i 0 i < 3 i 3 i++ i++ i {
			for (int j = 0; j < 3; j++) {
				c[i][j] = scan.nextInt();
			}
		} {
			for (int j = 0; j < 3; j++) {
				c[i][j] = scan.nextInt();
			}
		} for (int j = 0; j < 3; j++) {
				c[i][j] = scan.nextInt();
			} int j = 0; int j = 0; j 0 j < 3 j 3 j++ j++ j {
				c[i][j] = scan.nextInt();
			} {
				c[i][j] = scan.nextInt();
			} c[i][j] = scan.nextInt() c[i][j] c[i] c i j scan.nextInt() scan.nextInt scan boolean F = false; F false int A = 0; A 0 int B = 0; B 0 int C = 0; C 0 A = c[0][0]+c[1][0]+c[2][0] A c[0][0]+c[1][0]+c[2][0] c[0][0]+c[1][0]+c[2][0] c[0][0] c[0] c 0 0 c[1][0] c[1] c 1 0 c[2][0] c[2] c 2 0 B = c[0][1]+c[1][1]+c[2][1] B c[0][1]+c[1][1]+c[2][1] c[0][1]+c[1][1]+c[2][1] c[0][1] c[0] c 0 1 c[1][1] c[1] c 1 1 c[2][1] c[2] c 2 1 C = c[0][2]+c[1][2]+c[2][2] C c[0][2]+c[1][2]+c[2][2] c[0][2]+c[1][2]+c[2][2] c[0][2] c[0] c 0 2 c[1][2] c[1] c 1 2 c[2][2] c[2] c 2 2 for (int i = 0; i < 4; i++) {
			if ((A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0) {
				F = true;
			}
		} int i = 0; int i = 0; i 0 i < 4 i 4 i++ i++ i {
			if ((A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0) {
				F = true;
			}
		} {
			if ((A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0) {
				F = true;
			}
		} if ((A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0) {
				F = true;
			} (A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0 (A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0 (A-i) % 3 == 0 (A-i) % 3 (A-i) A i 3 0 (B-i) % 3 == 0 (B-i) % 3 (B-i) B i 3 0 (C-i) %3 == 0 (C-i) %3 (C-i) C i 3 0 {
				F = true;
			} F = true F true if (F) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		} F {
			System.out.println("Yes");
		} System.out.println("Yes") System.out.println System.out System System.out "Yes" {
			System.out.println("No");
		} System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[][] c = new int[3][3];
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				c[i][j] = scan.nextInt();
			}
		}
		boolean F = false;
		int A = 0;
		int B = 0;
		int C = 0;
		A = c[0][0]+c[1][0]+c[2][0];
		B = c[0][1]+c[1][1]+c[2][1];
		C = c[0][2]+c[1][2]+c[2][2];
		for (int i = 0; i < 4; i++) {
			if ((A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0) {
				F = true;
			}
		}
		if (F) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[][] c = new int[3][3];
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				c[i][j] = scan.nextInt();
			}
		}
		boolean F = false;
		int A = 0;
		int B = 0;
		int C = 0;
		A = c[0][0]+c[1][0]+c[2][0];
		B = c[0][1]+c[1][1]+c[2][1];
		C = c[0][2]+c[1][2]+c[2][2];
		for (int i = 0; i < 4; i++) {
			if ((A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0) {
				F = true;
			}
		}
		if (F) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[][] c = new int[3][3];
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				c[i][j] = scan.nextInt();
			}
		}
		boolean F = false;
		int A = 0;
		int B = 0;
		int C = 0;
		A = c[0][0]+c[1][0]+c[2][0];
		B = c[0][1]+c[1][1]+c[2][1];
		C = c[0][2]+c[1][2]+c[2][2];
		for (int i = 0; i < 4; i++) {
			if ((A-i) % 3 == 0 && (B-i) % 3 == 0 && (C-i) %3 == 0) {
				F = true;
			}
		}
		if (F) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}
