$4\mathrm{.}15$ LAB: Output range with increment of $5$

Write a program whose input is two integers. Output the first integer and subsequent increments of $5$ as long as the value is less than or equal to the second integer.

Ex: If the input is:

$-15$

$10$

the output is:

$-15,-10,-5,0,5,10$

Ex: If the second integer is less than the firstas in:

$20$

$5$

the output is:

Second integer can't be less than the first.

For coding simplicity, output a space after every integer, including the last. End the output with a newline.