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: twoeightzerothreeonezerozerofourtwo
Example Output: 280310042

Example Input: zerozerozerofoureighteightoneninefivenine
Example Output: 0004881959

Example Input: threeeighteightseventhreenineoneeight
Example Output:
38873918