#Simple Calculator
def add(a, b):
 return a + b

def subtract(a, b):
 return a - b

def multiply(a, b):
 return a * b

def divide(a, b):
 try:
 return a / b
 except ZeroDivisionError:
 return "Zero Division Error"
 
def power(a,b):
 return a**b

def main():
 print("Select Operation")
 print("1.Add")
 print("2.Subtract")
 print("3.Multiply")
 print("4.Divide")
 print("5.Power")

 choice = input("Enter Choice(+,-,*,/,^): ")
 num1 = int(input("Enter first number: "))
 num2 = int(input("Enter Second number:"))

 if choice == '+':
 print(num1, "+", num2, "=", add(num1, num2))

 elif choice == '-':
 print(num1, "-", num2, "=", subtract(num1, num2))

 elif choice == '*':
 print(num1, "*", num2, "=", multiply(num1, num2))

 elif choice == '/':
 print(num1, "/", num2, "=", divide(num1, num2))
 elif choice =="**":
 print(num1,"^",num2,"=",power(num1,num2))
 else:
 print("Invalid input")
 main()
main()