AT_abc462_a [ABC462A] Secret Numbers

You are given a string $ S $ consisting of lowercase English letters and digits. Extract only the digit characters from $ S $ and output the string formed by arranging them in their original order.

The input is given from Standard Input in the following format: > $ S $

Output the answer.

### Sample Explanation 1 The digits contained in `abc462` are `4`, `6`, `2`. Concatenating them in their original order gives `462`. Thus, output `462`. ### Sample Explanation 2 `codequeen` contains no digits, so output the empty string. ### Constraints - $ S $ is a string of length between $ 1 $ and $ 50 $ , inclusive, consisting of lowercase English letters and digits.