# Write your implementation in the next lines
# You will have 3 variables ready:
# first_operand, second_operand and operation
# first_operand contains a number, which is the first operand of the calculation
# second_operand is the same for the second operand of the calculation
# operation contains a string with the operation, this string can be:
# "+", "-", "*" or "/"
# you must store the result of the operation in a variable named result

result = 0