Digits Recovery

Mubashir shuffled a given string of letters by mistake. Some letters in the input string are representing a digit (from zero to nine). Help him to recover all the digits.

• Only consecutive letters can be used. "OTNE" cannot be recovered to 1.
• Every letter has to start with an increasing index. "ONENO" results to 11, because E can be used two times.
• You can ignore all letters in the string if they don't end-up in a digit.
• If no digits can be found, return "No digits found"
• Take care about the order! "ENOWT" will be recovered to 12 and not to 21.
• The input string consists only UpperCase letters.

Examples

digits_recovery("NEO") ➞ "1"

digits_recovery("ONETWO") ➞ "12"

digits_recovery("ZYX") ➞ "No digits found"

digits_recovery("NEOTWONEINEIGHTOWSVEEN") ➞ "12219827"

Notes

You can use dictionary in the code tab.