solve this

"""

Module to show off tuple methods.

Neither this module nor the function should import the introcs module.In addition,

the function should not use a loop or recursion.

"""

def replace_first(tup,a,b):

"""

Returns a copy of tup with the first value of a replaced by b

Examples:

replace_first((1,2,1),1,3) returns (3,2,1)

replace_first((1,2,1),4,3) returns (1,2,1)

Parameter tup: The tuple to copy

Precondition: tup is a tuple of integers

Parameter a: The value to replace

Precondition: a is an int

Parameter b: The value to replace with

Precondition: b is an int

"""