input: Write a python function to encrypt a string using a matrix transposition technique.
  assert encryptMatrixTranspose("AESTHETICISMISTHEFINESTART") == "AIMHHEEESCITSITSTEFINART"
  assert encryptMatrixTranspose("HELLOPYTHON") == "HLTPYOELO_HN__"
  assert encryptMatrixTranspose("DATAENCRYPTION") == "DTNRYYAACPOTIET"
output: def encryptMatrixTranspose(text):
      import math
      
      length = len(text)
      side = math.ceil(math.sqrt(length))
      padding = side * side - length
      padded_text = text + "_" * padding
      
      matrix = [padded_text[i:i+side] for i in range(0, len(padded_text), side)]
      transposed = ''.join(''.join(row[i] for row in matrix) for i in range(side))
      
      return transposed