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'.

threetwofouroneonesevenninefourfoureightninenine
324117944899

threeoneeightoneeighttwo
318182

onethreefivefiveninefourtwosevenninesevenzero

13559427970