There is an important skill called "version control" that we must learn.
The first step to be the master of version control is ── naming the files.
To make you remember how many times you modify the files, you decide to write down the version number in your file names, e.g. I2P(I)2021_Hu_problem_final_V2.c .
However, using the Arabic numerals is not cool enough so you decide to transfer the Arabic numerals into Roman numerals.
Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.
For example, 2 is written as II in Roman numeral, just two one's added together. 12 is written as XII, which is simply X + II. The number 27 is written as XXVII, which is XX + V + II.
Roman numerals are usually written largest to smallest from left to right. However, the numeral for four is not IIII. Instead, the number four is written as IV. Because the one is before the five we subtract it making four. The same principle applies to the number nine, which is written as IX. There are six instances where subtraction is used:
I can be placed before V (5) and X (10) to make 4 and 9. X can be placed before L (50) and C (100) to make 40 and 90. C can be placed before D (500) and M (1000) to make 400 and 900.
Please design the program so that you can become a super-coooooooool engineer.
An integer N (1<=N<=3999) implies the origin Arabic numerals.
The transfered Roman numerals represented in strings.
Note that you need to print a newline character in the end.