a = int(input('a = '))
b = int(input('b = '))
a = a + b
b = a - b
a = a - b
print('a =', a)
print('b =', b)
a = int(input('a = '))
b = int(input('b = '))
a = a + b
b = a - b
a = a - b
print('a =', a)
print('b =', b)