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All leaked interview problems are collected from Internet.

Given a **non-empty** string containing an out-of-order English representation of digits `0-9`

, output the digits in ascending order.

**Note:**

- Input contains only lowercase English letters.
- Input is guaranteed to be valid and can be transformed to its original digits. That means invalid inputs such as "abc" or "zerone" are not permitted.
- Input length is less than 50,000.

**Example 1:**

Input: "owoztneoer" Output: "012"

**Example 2:**

Input: "fviefuro" Output: "45"

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