i need help with program in c++

using isaplha and isdigit

while reading a file that has text and digits in it, so if the text file contains numbers in it, it would print out the numbers in it.

so while reading the character one by one, if is it is a digit, read the digit untill the next space, same with the words, if the file cotains words, read it untill the next space

so if the file contains

This year is 2018

the outcome would be

this is a word This

this is a word year

this is a word is

this is a number 2018