Evaluate Postfix Expression.
Evaluate Postfix Expression. Problem: Accept a postfix expression, evaluate it and print the result. Input: 10 3 1 * + 9 - Output: 4 Program: s = input().split() stack = [] for i in s: if i.isdigit(): stack.append(int(i)) else: b = stack.pop() a = stack.pop() if i == '+': stack.append(a+b) elif i == '-': stack.append(a-b) elif i == '*': stack.append(a*b) elif i == '/': stack.append(a//b) print(*stack) Explanation: 1. Accept a string S (postfix expression) and split the string with res...