
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		//		new Main().solveA();
		new Main().solveB();
		// new Main().solveC();
		// new Main().solveD();
	}

	private void solveA() {
		Scanner scanner = null;
		int numRating = 0;

		try {
			scanner = new Scanner(System.in);
			numRating = scanner.nextInt();

			if (numRating < 1200) {
				System.out.println("ABC");
			} else if (numRating < 2800) {
				System.out.println("ARC");
			} else {
				System.out.println("AGC");
			}

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveB() {
		Scanner scanner = null;
		String strS = "";

		try {
			scanner = new Scanner(System.in);
			strS = scanner.next();

			if (strS.charAt(0) != 'A') {
				System.out.println("WA");
				return;
			}
			int res = 0;
			int wkIndex = 0;
			for (int i = 2; i < strS.length() - 1; i++) {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			}
			if (res != 1) {
				System.out.println("WA");
				return;
			}
			for (int i = 0; i < strS.length(); i++) {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			}
			System.out.println("AC");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveC() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveD() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		//		new Main().solveA();
		new Main().solveB();
		// new Main().solveC();
		// new Main().solveD();
	}

	private void solveA() {
		Scanner scanner = null;
		int numRating = 0;

		try {
			scanner = new Scanner(System.in);
			numRating = scanner.nextInt();

			if (numRating < 1200) {
				System.out.println("ABC");
			} else if (numRating < 2800) {
				System.out.println("ARC");
			} else {
				System.out.println("AGC");
			}

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveB() {
		Scanner scanner = null;
		String strS = "";

		try {
			scanner = new Scanner(System.in);
			strS = scanner.next();

			if (strS.charAt(0) != 'A') {
				System.out.println("WA");
				return;
			}
			int res = 0;
			int wkIndex = 0;
			for (int i = 2; i < strS.length() - 1; i++) {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			}
			if (res != 1) {
				System.out.println("WA");
				return;
			}
			for (int i = 0; i < strS.length(); i++) {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			}
			System.out.println("AC");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveC() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveD() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}
} Main public static void main(String[] args) {
		//		new Main().solveA();
		new Main().solveB();
		// new Main().solveC();
		// new Main().solveD();
	} main {
		//		new Main().solveA();
		new Main().solveB();
		// new Main().solveC();
		// new Main().solveD();
	} new Main().solveB() new Main().solveB new Main() String[] args args private void solveA() {
		Scanner scanner = null;
		int numRating = 0;

		try {
			scanner = new Scanner(System.in);
			numRating = scanner.nextInt();

			if (numRating < 1200) {
				System.out.println("ABC");
			} else if (numRating < 2800) {
				System.out.println("ARC");
			} else {
				System.out.println("AGC");
			}

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	} solveA {
		Scanner scanner = null;
		int numRating = 0;

		try {
			scanner = new Scanner(System.in);
			numRating = scanner.nextInt();

			if (numRating < 1200) {
				System.out.println("ABC");
			} else if (numRating < 2800) {
				System.out.println("ARC");
			} else {
				System.out.println("AGC");
			}

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	} Scanner scanner = null; scanner null int numRating = 0; numRating 0 try {
			scanner = new Scanner(System.in);
			numRating = scanner.nextInt();

			if (numRating < 1200) {
				System.out.println("ABC");
			} else if (numRating < 2800) {
				System.out.println("ARC");
			} else {
				System.out.println("AGC");
			}

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		} {
			if (scanner != null) {
				scanner.close();
			}
		} if (scanner != null) {
				scanner.close();
			} scanner != null scanner null {
				scanner.close();
			} scanner.close() scanner.close scanner {
			scanner = new Scanner(System.in);
			numRating = scanner.nextInt();

			if (numRating < 1200) {
				System.out.println("ABC");
			} else if (numRating < 2800) {
				System.out.println("ARC");
			} else {
				System.out.println("AGC");
			}

		} scanner = new Scanner(System.in) scanner new Scanner(System.in) numRating = scanner.nextInt() numRating scanner.nextInt() scanner.nextInt scanner if (numRating < 1200) {
				System.out.println("ABC");
			} else if (numRating < 2800) {
				System.out.println("ARC");
			} else {
				System.out.println("AGC");
			} numRating < 1200 numRating 1200 {
				System.out.println("ABC");
			} System.out.println("ABC") System.out.println System.out System System.out "ABC" if (numRating < 2800) {
				System.out.println("ARC");
			} else {
				System.out.println("AGC");
			} numRating < 2800 numRating 2800 {
				System.out.println("ARC");
			} System.out.println("ARC") System.out.println System.out System System.out "ARC" {
				System.out.println("AGC");
			} System.out.println("AGC") System.out.println System.out System System.out "AGC" private void solveB() {
		Scanner scanner = null;
		String strS = "";

		try {
			scanner = new Scanner(System.in);
			strS = scanner.next();

			if (strS.charAt(0) != 'A') {
				System.out.println("WA");
				return;
			}
			int res = 0;
			int wkIndex = 0;
			for (int i = 2; i < strS.length() - 1; i++) {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			}
			if (res != 1) {
				System.out.println("WA");
				return;
			}
			for (int i = 0; i < strS.length(); i++) {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			}
			System.out.println("AC");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	} solveB {
		Scanner scanner = null;
		String strS = "";

		try {
			scanner = new Scanner(System.in);
			strS = scanner.next();

			if (strS.charAt(0) != 'A') {
				System.out.println("WA");
				return;
			}
			int res = 0;
			int wkIndex = 0;
			for (int i = 2; i < strS.length() - 1; i++) {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			}
			if (res != 1) {
				System.out.println("WA");
				return;
			}
			for (int i = 0; i < strS.length(); i++) {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			}
			System.out.println("AC");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	} Scanner scanner = null; scanner null String strS = ""; strS "" try {
			scanner = new Scanner(System.in);
			strS = scanner.next();

			if (strS.charAt(0) != 'A') {
				System.out.println("WA");
				return;
			}
			int res = 0;
			int wkIndex = 0;
			for (int i = 2; i < strS.length() - 1; i++) {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			}
			if (res != 1) {
				System.out.println("WA");
				return;
			}
			for (int i = 0; i < strS.length(); i++) {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			}
			System.out.println("AC");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		} {
			if (scanner != null) {
				scanner.close();
			}
		} if (scanner != null) {
				scanner.close();
			} scanner != null scanner null {
				scanner.close();
			} scanner.close() scanner.close scanner {
			scanner = new Scanner(System.in);
			strS = scanner.next();

			if (strS.charAt(0) != 'A') {
				System.out.println("WA");
				return;
			}
			int res = 0;
			int wkIndex = 0;
			for (int i = 2; i < strS.length() - 1; i++) {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			}
			if (res != 1) {
				System.out.println("WA");
				return;
			}
			for (int i = 0; i < strS.length(); i++) {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			}
			System.out.println("AC");

		} scanner = new Scanner(System.in) scanner new Scanner(System.in) strS = scanner.next() strS scanner.next() scanner.next scanner if (strS.charAt(0) != 'A') {
				System.out.println("WA");
				return;
			} strS.charAt(0) != 'A' strS.charAt(0) strS.charAt strS 0 'A' {
				System.out.println("WA");
				return;
			} System.out.println("WA") System.out.println System.out System System.out "WA" return; int res = 0; res 0 int wkIndex = 0; wkIndex 0 for (int i = 2; i < strS.length() - 1; i++) {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			} int i = 2; int i = 2; i 2 i < strS.length() - 1 i strS.length() - 1 strS.length() strS.length strS 1 i++ i++ i {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			} {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			} if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				} strS.charAt(i) == 'C' strS.charAt(i) strS.charAt strS i 'C' {
					res++;
					wkIndex = i;
				} res++ res wkIndex = i wkIndex i if (res != 1) {
				System.out.println("WA");
				return;
			} res != 1 res 1 {
				System.out.println("WA");
				return;
			} System.out.println("WA") System.out.println System.out System System.out "WA" return; for (int i = 0; i < strS.length(); i++) {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			} int i = 0; int i = 0; i 0 i < strS.length() i strS.length() strS.length strS i++ i++ i {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			} {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			} if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				} i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i)) i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i)) i != 0 i 0 i != wkIndex i wkIndex !Character.isLowerCase(strS.charAt(i)) Character.isLowerCase(strS.charAt(i)) Character.isLowerCase Character strS.charAt(i) strS.charAt strS i {
					System.out.println("WA");
					return;
				} System.out.println("WA") System.out.println System.out System System.out "WA" return; System.out.println("AC") System.out.println System.out System System.out "AC" private void solveC() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	} solveC {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	} Scanner scanner = null; scanner null int numN = 0; numN 0 int numK = 0; numK 0 int numS = 0; numS 0 try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		} {
			if (scanner != null) {
				scanner.close();
			}
		} if (scanner != null) {
				scanner.close();
			} scanner != null scanner null {
				scanner.close();
			} scanner.close() scanner.close scanner {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} scanner = new Scanner(System.in) scanner new Scanner(System.in) numN = scanner.nextInt() numN scanner.nextInt() scanner.nextInt scanner System.out.println("") System.out.println System.out System System.out "" private void solveD() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	} solveD {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	} Scanner scanner = null; scanner null int numN = 0; numN 0 int numK = 0; numK 0 int numS = 0; numS 0 try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		} {
			if (scanner != null) {
				scanner.close();
			}
		} if (scanner != null) {
				scanner.close();
			} scanner != null scanner null {
				scanner.close();
			} scanner.close() scanner.close scanner {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} scanner = new Scanner(System.in) scanner new Scanner(System.in) numN = scanner.nextInt() numN scanner.nextInt() scanner.nextInt scanner System.out.println("") System.out.println System.out System System.out "" public class Main {

	public static void main(String[] args) {
		//		new Main().solveA();
		new Main().solveB();
		// new Main().solveC();
		// new Main().solveD();
	}

	private void solveA() {
		Scanner scanner = null;
		int numRating = 0;

		try {
			scanner = new Scanner(System.in);
			numRating = scanner.nextInt();

			if (numRating < 1200) {
				System.out.println("ABC");
			} else if (numRating < 2800) {
				System.out.println("ARC");
			} else {
				System.out.println("AGC");
			}

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveB() {
		Scanner scanner = null;
		String strS = "";

		try {
			scanner = new Scanner(System.in);
			strS = scanner.next();

			if (strS.charAt(0) != 'A') {
				System.out.println("WA");
				return;
			}
			int res = 0;
			int wkIndex = 0;
			for (int i = 2; i < strS.length() - 1; i++) {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			}
			if (res != 1) {
				System.out.println("WA");
				return;
			}
			for (int i = 0; i < strS.length(); i++) {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			}
			System.out.println("AC");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveC() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveD() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}
} public class Main {

	public static void main(String[] args) {
		//		new Main().solveA();
		new Main().solveB();
		// new Main().solveC();
		// new Main().solveD();
	}

	private void solveA() {
		Scanner scanner = null;
		int numRating = 0;

		try {
			scanner = new Scanner(System.in);
			numRating = scanner.nextInt();

			if (numRating < 1200) {
				System.out.println("ABC");
			} else if (numRating < 2800) {
				System.out.println("ARC");
			} else {
				System.out.println("AGC");
			}

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveB() {
		Scanner scanner = null;
		String strS = "";

		try {
			scanner = new Scanner(System.in);
			strS = scanner.next();

			if (strS.charAt(0) != 'A') {
				System.out.println("WA");
				return;
			}
			int res = 0;
			int wkIndex = 0;
			for (int i = 2; i < strS.length() - 1; i++) {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			}
			if (res != 1) {
				System.out.println("WA");
				return;
			}
			for (int i = 0; i < strS.length(); i++) {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			}
			System.out.println("AC");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveC() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveD() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}
} Main

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		//		new Main().solveA();
		new Main().solveB();
		// new Main().solveC();
		// new Main().solveD();
	}

	private void solveA() {
		Scanner scanner = null;
		int numRating = 0;

		try {
			scanner = new Scanner(System.in);
			numRating = scanner.nextInt();

			if (numRating < 1200) {
				System.out.println("ABC");
			} else if (numRating < 2800) {
				System.out.println("ARC");
			} else {
				System.out.println("AGC");
			}

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveB() {
		Scanner scanner = null;
		String strS = "";

		try {
			scanner = new Scanner(System.in);
			strS = scanner.next();

			if (strS.charAt(0) != 'A') {
				System.out.println("WA");
				return;
			}
			int res = 0;
			int wkIndex = 0;
			for (int i = 2; i < strS.length() - 1; i++) {
				if (strS.charAt(i) == 'C') {
					res++;
					wkIndex = i;
				}
			}
			if (res != 1) {
				System.out.println("WA");
				return;
			}
			for (int i = 0; i < strS.length(); i++) {
				if (i != 0 && i != wkIndex && !Character.isLowerCase(strS.charAt(i))) {
					System.out.println("WA");
					return;
				}
			}
			System.out.println("AC");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveC() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}

	private void solveD() {
		Scanner scanner = null;
		int numN = 0;
		int numK = 0;
		int numS = 0;

		try {
			scanner = new Scanner(System.in);
			numN = scanner.nextInt();

			System.out.println("");

		} finally {
			if (scanner != null) {
				scanner.close();
			}
		}
	}
}