How would I create a simple length converter in Python?

Ok, well I'm a beginner in python, a beginner at the VERY beginning :P (I'm only on the 11th newboston tutorial :P) Well, maybe I'm getting ahead of myself a bit, but I wanted to create a length converter, like something that will convert feet to inches and centimeters. I wrote this, and it worked:

print "Unit conversion"

X = int(raw_input("How many feet are there?"))

ap = int(X)

aq = int(X*12)

ar = int(X*30.48)

total1 = ap

total2 = aq

total3 = ar

print "The totals are: " + `total1` + " feet or " + `total2`+ " inches or " + `total3` + " centimeters"

raw_input ("Press <enter>")

But now I want to write something that only converts to what is input at the very beginning, and so I wrote this, and it's probably really wrong and random, but here it is:

print "Unit conversion"

convert = str(raw_input("What would you like to convert the number of feet to?"))

amount = int(raw_input("How many feet are there?"))

A = int(amount*12)

B = int(amount*30.48)

if convert == str(inches):

print "The total is" + `A` + "inches"

if convert == str(centimeters):

print "The total is" + `B` + "centimeters"

raw_input ("Press <enter>")

Sooo... Can you tell me what all is wrong with ^ and how to fix it? Thank you!!!!