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: zerosevenfiveonethree
Example Output: 07513

Example Input: sevenfiveeighteighteightzerotwo
Example Output: 7588802

Example Input: foureightfourthreefourzerofiveone
Example Output:
48434051