Write a program in python that implements a simple calculator that performs 2 steps: 1) converts an infix expression to a postfix expression, and 2) evaluates the postfix expression and finally prints out the result. You should use stack operations in both steps above. Your implementation can assume the following: The calculator handles only +, -, *, / , % operators A single infix expression may have multiple operands, operators, and brackets All operands are numerical values All operands are a single digit each Tokens in the infix expression may or not be separated with white spaces Your program will read a sequence of infix expressions from a text file The text file is the following: 8 / 2 3 - 6 (2 + 3) * 6 (4 - 6) * (8 + 8) (4 % 7) * (5 - 3) (9 - 3) / (8 - 6)