TypeError: ‘str’ object cannot be interpreted as an integer [duplicate]

I don’t understand what the problem is with the code, it is very simple so this is an easy one.

x = input("Give starting number: ")
y = input("Give ending number: ")

for i in range(x,y):
 print(i)

It gives me an error

Traceback (most recent call last):
  File "C:/Python33/harj4.py", line 6, in <module>
    for i in range(x,y):
TypeError: 'str' object cannot be interpreted as an integer

As an example, if x is 3 and y is 14, I want it to print

Give starting number: 4
Give ending number: 13
4
5
6
7
8
9
10
11
12
13

What is the problem?