function dad(){}
dad.prototype.hairColor = "brown"
dad.prototype.changeHair = function(newColor) {this.hairColor = newColor;}

child1 = new dad()
child1.changeHair("red")

child2 = new dad()
child2.changeHair("blonde")

child3 = new dad()
child3.changeHair("purple")

print(child1.hairColor)
print(child2.hairColor)
print(child3.hairColor)

print("\n\n")
dad.prototype.changeHair("bald")
child4 = new dad()
print("\n\n")

print(child1.hairColor)
print(child2.hairColor)
print(child3.hairColor)

print(child4.hairColor)