core-xy deltaxyab

from sys import argv

def deltaX(a,b):
    return .5*(a+b)
def deltaY(a,b):
    return .5*(a-b)
def deltaA(x,y):
    return x+y
def deltaB(x,y):
    return x-y

a = int(raw_input('What is new position Delta A? '))
b = int(raw_input('What is new position Delta B? '))

pos_x = deltaX(a,b)
pos_y = deltaY(a,b)
pos_a = deltaA(pos_x,pos_y)
pos_b = deltaB(pos_x,pos_y)

print("""
New Position dX = %s
New Position dY = %s
New Position dA = %s
New Position dB = %s
""" % (pos_x,pos_y,pos_a,pos_b))