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: fourfivetwotwozeroonesevenfive
Example Output: 45220175

Example Input: onezerofourthreeeightfivesixthreefivethreefour
Example Output: 10438563534

Example Input: zerotwoeightfiveseven
Example Output:
02857