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## Statement

## Goal

The goal of this exercise is to add two lengths with given metric units.To calculate it properly you first need to convert them to the same unit.

Present the result using the smaller unit.

For instance:

**4cm + 2dm**

must convert 2dm to 20cm:

**4cm + 20cm**

it then results to:

**24cm**

If you like to challenge yourself a little more...

Try to limit the number of

**ifs**and

**switches**as much as possible in your code.

Input

**Line 1:**the expression to calculate

`value`

`unit`

`value`

`unit`

Output

`value`

`unit`

`value`should be a sum of two given values after units conversion to the smaller one.

`unit`should be the smaller unit of the two parameters.

Constraints

`value`is a real number:

0 <=

`value`<= 1000

with precision <=

`unit`can be one of the following:

- um (micrometer)

- mm (millimeter) where 1mm = 1000um

- cm (centimeter) where 1cm = 10mm

- dm (decimeter) where 1dm = 10cm

- m (meter) where 1m = 10dm

- km (kilometer) where 1km = 1000m

Example

Input

1m + 1cm

Output

101cm

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