Given a string s containing an out-of-order English representation of digits 0-9, return the digits in ascending order. Example 1: Input: s = "owoztneoer" Output: "012" Example 2: Input: s = "fviefuro" Output: "45" Constraints: 1 <= s.length <= 105 s[i] is one of the characters ["e","g","f","i","h","o","n","s","r","u","t","w","v","x","z"]. s is guaranteed to be valid.