import time

a =['3', '3', '*', '5', '+', '9', '-', '\n',
    '6', '2', '-', '3', '-', '8', '*', '\n',
    '10', '10', '*', '3', '+', '99', '-', '\n',
    '2', '4', '6', '*', '*', '4', '-', '\n',
    '7', '0', '-', '0', '*', '\n',
    '2', '9', '7', '/', '/', '\n',
    '9', '6', '3', '/', '2', '9', '-', '-', '+','\n',
    '4', '5', '/', '5', '5', '*', '5', '/','/','\n',
    '3', '5', '/', '5', 'not', '*']


def main(x):
    stack = []
    temp = 0.0
    for i in a:
        if i.isnumeric():
            stack.append(float(i))
        elif i == '\n':
            print(stack[0])
            stack=[]
            time.sleep(0)
        else:
            if i == '*':
                temp = stack.pop()*stack.pop()
            if i == '/':
                try:
                    temp = stack.pop(-2)/stack.pop()
                except ZeroDivisionError:
                    print('Cant divide by 0')
            if i == '+':
                temp = stack.pop()+stack.pop()
            if i == '-':
                temp = stack.pop(-2)-stack.pop()
            # Have no idea how this is supposed to work :(
            if i == 'not':
                print("WHAT DOES THIS DO!")
            stack.append(temp)
            temp=0.0



main(a)