PROGRAMMING:Digital conversion

Convert Arabic numerals greater than 0 and less than 1000 to Roman numerals.
Represents the single digits: I, II, III, IV, V, VI, VII, VIII, IX
Represents ten digits: X, XX, XXX, XL, l, LX, LXX, LXXX, LXXX, XC
Represents hundreds: C, CC, CCC, CD, D, DC, DCC, DCCC, cm
###Input format:
Enter an integer n.
###Output format:
Output a Roman numeral converted from n.
###Input example:
Here is a set of inputs. For example:
```in
one
twelve
one hundred and twenty-three
```
###Output example:
The corresponding output is given here. For example:
```out
I
XII
CXXIII
```







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