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'.
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Question: sevenonesixninezeroeightonetwoeight

Answer: 716908128


Question: fourtwotwoonetwooneeightfivethree

Answer: 422121853


Question: fourzerofoursevenseveneight

Answer:
404778