public class Main {
public static void main(String[] args) {
String numbers = "1234567890";
for (int i = 0; i < numbers.length(); i++) {
if (Character.isDigit(numbers.charAt(i))) {
System.out.println(numbers.charAt(i) + " is a number.");
} else {
System.out.println(numbers.charAt(i) + " not a number.");
}
}
}
}