PROGRAMMING:Suffix evaluation
We humans are used to writing infixes, such as' 3 + 5 * 2 ', whose value is' 13'（ p. Why do people get used to infix? Is it because infixes are easier to use than suffixes< br>
And computers are more used to "suffix" (also known as "reverse Polish notation"). The suffixes corresponding to the above infixes are: ` 3 5 2 * + '< br > 1
Now, evaluate the input suffix.
###Input format:
Enter a suffix in one line. The operands and operators are separated by spaces. The length of operands is no more than 6 bits. There are only four kinds of operators.
###Output format:
Output the value of suffix in one line, and keep one decimal place.
###Input example:
```in
3 5.4 2.2 * +
```
###Output example:
```out
fourteen point nine
```
answer：If there is no answer, please comment
And computers are more used to "suffix" (also known as "reverse Polish notation"). The suffixes corresponding to the above infixes are: ` 3 5 2 * + '< br > 1
Now, evaluate the input suffix.
###Input format:
Enter a suffix in one line. The operands and operators are separated by spaces. The length of operands is no more than 6 bits. There are only four kinds of operators.
###Output format:
Output the value of suffix in one line, and keep one decimal place.
###Input example:
```in
3 5.4 2.2 * +
```
###Output example:
```out
fourteen point nine
```
answer：If there is no answer, please comment