Hello, prasum!

If you've had no experience with "alphametics",

. . no wonder you're having difficulty.

You should be able to see that

(If you can't, these problems are not for you.)

In column-3, we see that ends in

Then there are two possible cases:

. . (1)

. . (2) with a "carry" from column-4.

(1) Suppose

We have: .

In column-6, with no carry.

In column-5: . ends in with a carry.

. . Hence:

In column-4: . with no carry.

In column-2: .

In column-6, let

. . Then

In column-4:

In column-2:

We have found one solution: .

There may be other solutions.