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## bmi – Body Mass Index

The Body Mass Index (BMI) can be used to classify weight in adults.
The BMI of a person is given by
the weight in kilogrammes divided by the square of the height in metres
[WHO, CDC, NHS].
Based on the BMI,
a person can be classified in one of four statistical categories:
underweight,
normal weight,
overweight
or obese. See the following table:

```
BMI = w/h² (kg/m²)
BMI < 18.5 underweight
18.5 ≤ BMI < 25 normal weight
25 ≤ BMI < 30 overweight
30 ≤ BMI obese
```

The above are *statistical* categories.
To evaluate an individual’s health,
one should consult with a trained healthcare provider.

Write a program that
given the weight and height of a person
prints the corresponding BMI classification.

### Input and Output

The input consists of several lines,
each containing two numbers *h* and *w*
with up to two decimal points where

0.10 ≤ *h* < 3.00

1.0 ≤ *w* ≤ 999.9

For each line of input,
the output should contain a single line with the corresponding BMI
classification in lowercase letters:
`underweight`

,
`normal weight`

,
`overweight`

or
`obese`

.

#### Example input

```
1.75 69.9
1.60 65
1.91 111.1
```

#### Example output

```
normal weight
overweight
obese
```

### Scoring

`1/4`

: works for the above example but with an incorrect format
`2/4`

: works for the above example in the correct format
`3/4`

: works for other test cases
`4/4`

: works for the edge test cases

try first: oddeven

try next: triangle

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