Problems

# Roman numerals

# Roman numerals

Count the sum of two natural numbers `A`

and `B`

, which have written in roman system of numeration. The answer you must write too in roman system of numeration.

`M = 1000`

, `D = 500`

, `C = 100`

, `L = 50`

, `X = 10`

, `V = 5`

, `I = 1`

(all numbers is less 2000).

## Input data

In line wrote two number of roman system numeration, between which stand mark "+".

## Output data

One number, sum of numbers is roman system numeration too. Numbers in roman system numeration wrote big Latin letters.

## Examples

Input example #1

III+IV

Output example #1

VII