abstract class Being {
	int life, energy, attack, defense;
	
	Being() {
		this.life = 10;
		this.energy = 10;
	}
	
	Being(int life) {
		this.life = life;
		this.energy = 10;
	}
	
	public abstract int attack(Being b);
}

class Human extends Being {
	public int attack(Being b) {
		int dmg = attack - b.defense;
		
		dmg = (dmg < 0) ? 0 : dmg;
	
		b.life = life - dmg;
		
		return dmg;
	}
}

class Game {
	public static void main(String[] args) {
		Human tom = new Human();
		Human stan = new Human();
		
		tom.attack = 3;
		tom.defense = 3;
		
		stan.attack = 5;
		stan.defense = 5;
		
		System.out.printf("tom life: %s\n", tom.life);
		System.out.printf("stan life: %s\n", stan.life);
		
		System.out.printf("tom attacks stan for %s damage!\n", tom.attack(stan));
		
		System.out.printf("tom life: %s\n", tom.life);
		System.out.printf("stan life: %s\n", stan.life);
		
		System.out.printf("stan attacks tom for %s damage!\n", stan.attack(tom));
		
		System.out.printf("tom life: %s\n", tom.life);
		System.out.printf("stan life: %s\n", stan.life);
	}
}