title: Unsupported operand type(s) for ** or pow(): 'str' and 'int'
body: <p>Thats my code, I don't know why the program gives me that Error.. PD: I'm a beginner in this programming language.</p>
  
  <pre><code>import math
  while True:
  A=input("Escribe el Valor de la 1ra Variable : ")
  B=input("Escribe el Valor de la 2da Variable : ") 
  C=input("Escribe el Valor de la 3ra Variable : ")
  Ec1 = (B * -1)
  Ec2 = (B ** 2 - 4 * A * C)
  Ec3 = (2*A)
  R = math.sqrt(Ec2)
  X1 = Ec1 + R / Ec3
  X2 = Ec1 - R / Ec3
  print('''El Valor de Su Ecuacion Es:/n
  X1 = %d
  X2 = %d''' % (X1, X2))
  </code></pre>