Expand a Number I

Create a function that expands a number into a string as shown below:

25 ➞ "20 + 5"
70701 ➞ "70000 + 700 + 1"
685 ➞ "600 + 80 + 5"

Examples

expanded_form(70304) ➞ "70000 + 300 + 4"

expanded_form(1037903) ➞ "1000000 + 30000 + 7000 + 900 + 3"

expanded_form(802539) ➞ "800000 + 2000 + 500 + 30 + 9"

Notes

N/A