import math

def add(x, y):
   return x + y

def subtract(x, y):
   return x - y

def multiply(x, y):
   return x * y

def divide(x, y):
   if y == 0:
       raise ValueError("Division by zero is not allowed.")
   return x / y

def power(x, y):
   return x ** y

def square_root(x):
   if x < 0:
       raise ValueError("Square root of negative number is not allowed.")
   return x ** 0.5

def calculator():
   sign = input("Enter a sign (+, -, *, /, ^, sqrt): ")
   if sign not in ['+', '-', '*', '/', '^', 'sqrt']:
       print("Invalid sign. Please enter a valid sign (+, -, *, /, ^, sqrt).")
       return
   x = float(input("Enter your first number: "))
   y = float(input("Enter your second number: "))
   if sign == '+':
       print("The sum of the given numbers is", add(x, y))
   elif sign == '-':
       print("The difference of the given numbers is", subtract(x, y))
   elif sign == '*':
       print("The product of the given numbers is", multiply(x, y))
   elif sign == '/':
       try:
           print("The quotient of the given numbers is", divide(x, y))
       except ValueError as e:
           print(e)
   elif sign == '^':
       print("The power of the given numbers is", power(x, y))
   elif sign == 'sqrt':
       try:
           print("The square root of the given number is", square_root(x))
       except ValueError as e:
           print(e)
calculator()