A1396. [COCI-2020-2021-contest6]#3 Bold

In addition to the usual age-related health problems such as first signs of RSI 1 and physical injuries that accumulate faster than they heal, Daniel’s eyesight has suddenly worsened.
Paula wrote him a letter, but he can’t read it without glasses. She needs to bold the text, so Daniel can read it.
The letter can be represented as a matrix consisting of characters ’.’ and ’#’. To bold it, Paula will replace each ’#’ in the original letter with a 2 × 2 square of ’#’ in the down-right direction.

The first line contains integers n and m (2 ≤ n, m ≤ 100), the dimensions of the letter.
Each of the following n lines contains m characters ’.’ and ’#’ that represent Paula’s letter.
The last row and column won’t contain any ’#’.

Output n lines containing m characters ’.’ and ’#’, representing the bold letter.