Here, in units place,

1 + B = 0

Which means that B = -1 which is not possible.

Hence, one is carry is given to ten’s place.

∴ A + 1 +1 = B …(1)

Now in unit’s place, we need to subtract 10 as one carry is given in ten’s place

∴ 1 + B – 10 = 0

∴ B = 9

Substituting in 1,

A + 1 + 1 = 9

∴ A =7

Hence, A = 7 and B = 9