The corrent selected programming language is C$.$ We emanasize the subimisist of a f$$lly working code over partially correct but efficient code. Once submitted, you cartat enview this problem again. You can use printf$()$ to debug your code. The print$/$l$/$ may not work in case of syntes$/$runtime error. The version of GCC being used is

$5\mathrm{.}5\mathrm{.}0.$

A company provides network encryption for secune data transfer, The data string is encrypted prior to transmission and gets decrypted at the receiving and. But due to to some technical error, the encrypted data is lost and the received string is different from the original suing by character. Arnold, a network administrator, is tasked with finding the character that got lost in the network so that the bug does not harm other data that is being transferred through the network.

Write an algorithm to help Arnald find the character that was missing at the receiving end but present at the sending end.

Input

The first line of the input consists of a string$-$string Sent, representing the string that was sent through the network.

The next line consists of a string$-$stringRec, representing the string that was received at the receiving end of the network.

Output

Print a character representing the character that was lost in the network during transmission,

Note

The input strings string Sent and string Rec consist of lowercase and uppercese English alphabets$[$i$.$e$.$ a$-$z$,$ A$-$Z$].$

Example

Input:

abcdfjgerj

abcdfjger

Output:

Explanation:

Q Search

$25$

$910$