public class u1a9 {

	public static void main(String[] args) {
		String s1 = "I’m ";
		String s2 = " years old.";
		int age = 4;
		++age;
		age += 14;
		age--;
		System.out.println(s1 + age + s2);
		System.out.println("1"+"8"); // String
		System.out.println(1+8);     // int
	}

}