In this task you will be given a string that only contains single digit numbers spelled out. The input string will not contain spaces between the different numbers. Your task is to return the number that the string spells out. The string will spell out each digit of the number for example '1726' will be 'oneseventwosix' instead of 'one thousand seven hundred six'.

Example Input: sixtwosixsixninefivefivenineninezerozero
Example Output: 62669559900

Example Input: fourseveneightninetwosevenfouronethree
Example Output: 478927413

Example Input: zeroeightsevenfourninefive
Example Output:
087495