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: threesixsixeightzerozerotwo
Example Output: 3668002

Example Input: onethreeeightninefourtwosixnineonesevenfoureight
Example Output: 138942691748

Example Input: twozerofourthreefourthreetwonineeightsevenzeroeight
Example Output:
204343298708

