编程题：Different temperatures

Your program reads today temprature, then judge the input temperature value and output the corresponding information.

If temprature is greater than 30 ，output：
It's a hot day
Drink plenty of water
Otherwise, if it's between 20 and 30，output：
It's a nice day
Otherwise output：
It's cold

### Input Format:

A whole number.

### Output Format:

one or two sentence according to temparture value。

### Sample Input:

A set of inputs is given here. For example:
in
14


### Sample Output:
The corresponding output is given here. For example:
out
It's cold

### Sample Input:
A set of inputs is given here. For example:
in
23


### Sample Output:
The corresponding output is given here. For example:
out
It's a nice day

### Sample Input:
A set of inputs is given here. For example:
in
33


### Sample Output:
The corresponding output is given here. For example:
out
It's a hot day
Drink plenty of water









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