input: 
  class Matrix:
      def __init__(self, m, n, lst): 
          self.m = m             
          self.n = n             
          self.mat = [] 
    
          c = 0
          for i in range(self.m): 
              a =[] 
              for j in range(self.n): 
                      a.append(lst[c]) 
                      c += 1
              self.mat.append(a) 
    
      def __str__(self): 
          output = ""
          for i in self.mat: 
              for j in i: 
                  output += str(j) + " "
              output += '\n'
          return output 
    
      def add(self, mat2): 
          for i in range(self.m): 
              for j in range(self.n): 
                  self.mat[i][j] += mat2.mat[i][j] 
    
      def sub(self, mat2): 
          for i in range(self.m): 
              for j in range(self.n): 
                  self.mat[i][j] -= mat2.mat[i][j]
      
      def mul(self, mat2): 
          result = [] 
          for i in range(self.m): 
              a =[] 
              for j in range(mat2.n): 
                  s = 0
                  for k in range(self.n): 
                      s += self.mat[i][k] * mat2.mat[k][j] 
                  a.append(s) 
              result.append(a) 
          self.mat = result 
          self.m = len(result) 
          self.n = len(result[0]) 
    
      def transpose(self):
          result = [[self.mat[j][i] for j in range(len(self.mat))] for i in range(len(self.mat[0]))]
          self.mat = result 
          self.m = len(result) 
          self.n = len(result[0])
  
  def Matrix_Operations():
      """This function is used to test the Matrix class which can perform various matrix operations like addition, subtraction, multiplication, and transpose.
      Example:
      mat1 = Matrix(2, 2, [1, 2, 3, 4])
      mat2 = Matrix(2, 2, [5, 6, 7, 8])
      mat1.add(mat2)
      print(mat1)
      Expected Output:
      6 8 
      10 12 
      """
      pass
  
output:     
      mat1 = Matrix(2, 2, [1, 2, 3, 4])
      mat2 = Matrix(2, 2, [5, 6, 7, 8])
      mat1.add(mat2)
      print(mat1)
      mat1 = Matrix(2, 2, [1, 2, 3, 4])
      mat2 = Matrix(2, 2, [5, 6, 7, 8])
      mat1.sub(mat2)
      print(mat1)
      mat1 = Matrix(2, 2, [1, 2, 3, 4])
      mat2 = Matrix(2, 2, [5, 6, 7, 8])
      mat1.mul(mat2)
      print(mat1)
      mat1 = Matrix(2, 2, [1, 2, 3, 4])
      mat1.transpose()
      print(mat1)
  