The first digits of all those numbers are either 3,4,5, or 6.
Write those in a column:

3
4
5
6

Now draw a vertical line just right of that column:

3|
4|
5|
6|

For 46, put the last digit 6 in line with the 4 to the right of the line.
For 65, put the last digit 5 in line with the 6 to the right of the line.
For 55, put the last digit 5 in line with the 5 to the right of the line.
For the first 3 numbers in the list, so far we have this:

3|
4|6
5|5
6|5

For 43, put the last digit 3 on line with the 4 to the right of the 6 that's
already there, like this:

3|
4|63
5|5
6|5

For 51, put the last digit 1 on line with the 5 to the right of the 5 that's
already there, like this:

3|
4|63
5|51
6|5

Continue the process through all the numbers:

3|02
4|63839
5|5175
6|5

Now redraw it, arranging the digits right of the line in numerical order:

3|02
4|33689
5|1557
6|5 

That's it.  1st digits go left of the line, last digits go right of the line.

Notice that if you turn your head 90° to the right, it looks like a
histogram.

Edwin