from math import sqrt  
  
print('Pythagorean theorem calculator! Calculate your triangle sides.')  
print('Assume the sides are a, b, c and c is the hypotenuse (the side opposite the right angle')  
formula = input('Which side (a, b, c) do you wish to calculate? side> ')  
  
if formula == 'c':  
    side_a = int(input('Input the length of side a: '))  
    side_b = int(input('Input the length of side b: '))  
  
    side_c = sqrt(side_a * side_a + side_b * side_b)  
      
    print('The length of side c is: ' )  
    print(side_c)  
  
elif formula == 'a':  
    side_b = int(input('Input the length of side b: '))  
    side_c = int(input('Input the length of side c: '))  
      
    side_a = sqrt((side_c * side_c) - (side_b * side_b))  
      
    print('The length of side a is' )  
    print(side_a)  
  
elif formula == 'b':  
    side_a = int(input('Input the length of side a: '))  
    side_b = int(input('Input the length of side c: '))  
          
    side_c = sqrt(side_c * side_c - side_a * side_a)  
      
    print('The length of side b is')  
    print(side_c)  
  
else:  
    print('Please select a side between a, b, c')