public class CheckDigit {
	public static void main(String[] args) {
		char charNoVar = '1';
		if (Character.isDigit(charNoVar)) {
			System.out.println("true");
		} else {
			System.out.println("false");
		}
		char charVar = 'A';
		if (Character.isDigit(charVar)) {
			System.out.println("true");
		} else {
			System.out.println("false");
		}
	}
}