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: fivezeronineeighteight
Example Output: 50988

Example Input: twotwosevenzerosixtwofivetwothree
Example Output: 227062523

Example Input: sixthreeonefoureightnineseven
Example Output:
6314897