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: foursevenfiveonenineninefivefivesevenseveneight
Example Output: 47519955778

Example Input: onethreezerozeroseventhreethreeeightsixeightnine
Example Output: 13007338689

Example Input: twosixfourthreeeight
Example Output:
26438