"if" beginner question

[Naito]

thank you guys for your suggestions
i am just woundering why this code dosen't work:

x="milk","Milk","MILK"
y="sugar","Sugar","SUGAR"
z="tea","Tea","TEA"
t="Coffee","Coffee","COFFEE"
print("please choose the combination you like")
print("milk sugar tea coffee")
a = input("chose the first one")
b = input("choose the second one:")
if a == x and b == z:
 print("????????????")
elif a == x and b == t:
 print("typical")
elif a == y and b == z:
 print("okay")
elif a == y and b == t:
 print("wake up")
else:
 print("is there any other comb?")

output:

please choose the combination you like
milk sugar tea coffee
chose the first onemilk
choose the second one:coffee
is there any other comb?

Process finished with exit code 0

iam trying to learn by making some mistakes while coding thanks guys