class Matrix:
    def __init__(self, matrix_string):
        self.rows = [[int(s) for s in row_string.split()]
                     for row_string in matrix_string.split('\n')]

    def row(self, index):
        if index < 1:
            raise ValueError("Row index must be no less than 1")

        return self.rows[index - 1]

    def column(self, index):
        if index < 1:
            raise ValueError("Row index must be no less than 1")

        return [row[index - 1] for row in self.rows]