TASK DEFINITION: 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'.
PROBLEM: zerozeroseveneighttwoninefiveoneeightthreefour

SOLUTION: 00782951834

PROBLEM: ninethreeeightninefoureightzeroseven

SOLUTION: 93894807

PROBLEM: ninesixfivesevensixthreefiveninefivenine

SOLUTION:
9657635959