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: twoonetwoonetwoeightthreefive
Example Output: 21212835

Example Input: sixzerozeroseventwosixsixfoursixoneeighttwo
Example Output: 600726646182

Example Input: threezeroonenineoneeightfourfiveone
Example Output:
301918451