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Statement

 Goal

You are given 2 expressions representing 2 numbers written in roman numerals.
You have to provide the result of the sum of these 2 numbers, also in roman numerals.

I has a value of 1 (maximum 3 in a row)
V has a value of 5 (maximum 1 in a row)
X has a value of 10 (maximum 3 in a row)
L has a value of 50 (maximum 1 in a row)
C has a value of 100 (maximum 3 in a row)
D has a value of 500 (maximum 1 in a row)
M has a value of 1000 (maximum 4 in a row)

The character I just before an V or X has a value of -1 (example IX equals 9)
The character X just before an L or C has a value of -10 (example XL equals 40)
The character C just before an D or M has a value of -100 (example CM equals 900)
Input
Line 1 : Rom1 (the 1st number in roman numerals)
Line 2 : Rom2 (the 2nd number in roman numerals)
Output
The result of Rom1 + Rom2 written in roman numerals
Constraints
1 ≤ Rom1 ≤ 4999
1 ≤ Rom2 ≤ 4999
1 ≤ Rom1 + Rom2 ≤ 4999
Example
Input
VI
VII
Output
XIII
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