PROGRAMMING:Factorial

#####Title Description
Can you work out the factorial of a positive integer?
#####Input Description:
Several lines, each line an integer n (1 < = n < = 20).
#####Output Description:
Output the factorial of each integer in order, one result on one line.
#####Input sample 1
```in
two
six
```
######Output sample 1
```out
two
seven hundred and twenty
```
#####Input sample 2
```in
five
one
three
```
#####Output sample 2
```out
one hundred and twenty
one
six
```






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