Cracking the Code

Wet Shark once had 2 sequences: {a_n}= {a_1, a_2, a_3, ... , a_(109)} {b_n} = {b_1, b_2, b_3, ... , b_(109)} However, he only kept one element from each sequence. Luckily, both the elements that Wet Shark kept have the same index in Wet Shark's sequences: that is, he took a_i and b_i for some 1 ≤ i ≤ 109. Right after Wet Shark loses his sequences, he finds that he actually needs them to break