operator = input('Enter an operator (+ - * /): ')
num1= float (input('Enter the 1st number: '))
num2= float (input('Enter the 2nd number: '))

if operator == "+":
    result = num1 + num2
    print(round(result, 3))
elif operator == "-":
    result = num1 - num2
    print(round(result, 3))
elif operator == "*":
    result = num1 * num2
elif operator == "/":
    result = num1 / num2
else:
    print (f"{operator} is not vaild operator")