first_number = int(input("First number: "))
operator = input("operator: ")
second_number = int(input("Second number: "))
def calculator(first_number,operation,second_number):
    if operator == "+":
        return first_number + second_number
    elif operator == "-":
        return first_number - second_number
    elif operator == "*":
        return first_number * second_number
    else:
        return number1/number2
        print(sum)
