num1 = float(input("Enter first number: "))
operation = input("Enter operation: ").lower()
num2 = float(input("Enter second number: "))

addition = ["add", "addition", "plus", "+", "combine"]
subtraction = ["subtract", "subtraction", "minus", "-", "deduct", "deduction"]
multiplication = ["multiply", "multiplication", "times", "*"]
division = ["divide", "division", "obelus", "over", "/", "\\"]

def calculator(num1, num2, operation):
    if operation in addition:
        return num1+num2
    elif operation in subtraction:
        return num1-num2
    elif operation in multiplication:
        return num1*num2
    elif operation in division:
        return num1/num2
    else:
        return ("Error: Unknown operation.")

result = calculator(num1, num2, operation)

#OPTION 1:
try:
    if result.is_integer():
        print(int(result))
    else:
        print(result)
except:
    print(result)


#OPTION 2:
#if isinstance(result, float):
#    if result.is_integer():
#        print(int(result))
#    else:
#        print(result)
#else:
#    print(result)