Today Vin defined a new binary operation named Vin_add for positive integers.

Vin_add is defined as summing two positive integers such that we neglect carry at every step while doing summation.

You are given two positive integers P and Q.

you need to find two integers A ( 0 < A <= P ) and B ( 0 < B <= Q ) such that vin_add is maximum for them.

Your output will be Vin_add( A , B ).

INPUT -

OUTPUT -

CONSTRAINTS -