Easy As Jigsaw ABC (Logical Puzzles Series #5)

This puzzle was created in year 2010 for 11th 24 Hr Championship. I created few puzzles of this type for 24 Hr. Championship. However this puzzle got selected to be part of that championship.

I am now re-publishing this Easy As Jigsaw ABC as 5th puzzle in Logical Puzzles Series.

Rules of Easy As Jigsaw ABC puzzle

Place letters A-D so that in each row, in each column, in each outlined area and in the remaining grey cells inside the grid there will exist exactly one of each letter A, B, C and D. The letters outside the grid indicate the letter seen first in the corresponding direction.

Easy As Jigsaw ABC Example