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Given a rectangular matrix of characters, add a border of asterisks(*) to it.

Example

For

picture = ["abc",
       "ded"]

the output should be

addBorder(picture) = ["*****",
                  "*abc*",
                  "*ded*",
                  "*****"]

Hints

• concat()
• unshift()
• push()

Input/Output

• [time limit] 4000ms (js)
• [input] array.string picture

A non-empty array of non-empty equal-length strings.

Guaranteed constraints:

1 ≤ picture.length ≤ 5,

1 ≤ picture[i].length ≤ 5.

• [output] array.string

The same matrix of characters, framed with a border of asterisks of width 1.