# Task
 Four men, `a, b, c and d` are standing in a line, one behind another. 
 
 There's a wall between the first three people (a, b and c) and the last one (d).
 
 a, b and c are lined up in order of height, so that person a can see the backs of b and c, person b can see the back of c, and c can see just the wall.

 There are 4 hats, 2 black and 2 white. Each person is given a hat. None of them can see their own hat, but person a can see the hats of b and c, while person b can see the hat of person c. Neither c nor d can see any hats.

 Once a person figures out their hat's color, they shouts it. 
 
 ![](http://stuffbox.in/wp-content/uploads/2016/08/Guess-hat-colour-604x270.png)
 
 Your task is to return the person who will guess their hat first. You can assume that they will speak only when they reach a correct conclusion.

# Input/Output


 - `[input]` string `a`

  a's hat color ("white" or "black").


 - `[input]` string `b`

  b's hat color ("white" or "black").


 - `[input]` string `c`

  c's hat color ("white" or "black").


 - `[input]` string `d`

  d's hat color ("white" or "black").


 - `[output]` an integer

 The person to guess his hat's color first, `1 for a, 2 for b, 3 for c and 4 for d`.

Difficulty: EASY
Starter code: def guess_hat_color(a,b,c,d):
	

Solutions:
def guess_hat_color(a, b, c, d):
	return 1 if b == c else 2


guess_hat_color = lambda a, b, c, d: 2 - (b == c)


guess_hat_color = lambda a, b, c, d: 1 + (b != c)


def guess_hat_color(a, b, c, d):
	return (b != c) + 1


guess_hat_color = lambda *a: len({*a[::3]})


guess_hat_color = lambda *a: len({*a[1:3]})


def guess_hat_color(a, b, c, d):
	w = 0
	bl = 0
	if b == 'white':
		w += 1
	if b == 'black':
		bl += 1
	if c == 'white':
		w += 1
	if c == 'black':
		bl += 1
	if w == bl:
		return 2
	else:
		return 1