PROGRAMMING:Output Fahrenheit centigrade temperature conversion table
Enter two positive integers' lower 'and' upper '('lower' $$Le $$$upper '$$Le $$100), please output a Fahrenheit centigrade temperature conversion table with the value range of ['lower','upper '], and each time increase 2 degrees Fahrenheit.
Calculation formula of temperature conversion: $$C = 5 times (F - 32) / 9 $$, where: $$C $$represents centigrade temperature and $$f $$represents Fahrenheit temperature.
###Input format:
Enter two integers in one line to represent the values of 'lower' and 'upper', separated by spaces.
###Output format:
The first line output: "Fahr Celsius"
Next, each line outputs a Fahrenheit Fahr (integer) and a centigrade Celsius (6 characters wide, right aligned, 1 decimal place).
If the input range is illegal, output "invalid.".
###Input sample 1:
```in
32 35
```
###Output sample 1:
```out
fahr celsius
32 0.0
34 1.1
```
###Input sample 2:
```
40 30
```
###Output sample 2:
```
Invalid.
```
answer：If there is no answer, please comment
Calculation formula of temperature conversion: $$C = 5 times (F - 32) / 9 $$, where: $$C $$represents centigrade temperature and $$f $$represents Fahrenheit temperature.
###Input format:
Enter two integers in one line to represent the values of 'lower' and 'upper', separated by spaces.
###Output format:
The first line output: "Fahr Celsius"
Next, each line outputs a Fahrenheit Fahr (integer) and a centigrade Celsius (6 characters wide, right aligned, 1 decimal place).
If the input range is illegal, output "invalid.".
###Input sample 1:
```in
32 35
```
###Output sample 1:
```out
fahr celsius
32 0.0
34 1.1
```
###Input sample 2:
```
40 30
```
###Output sample 2:
```
Invalid.
```
answer：If there is no answer, please comment