ABCD Puzzle/Crypto variant/en
The normal rules for ABCD puzzles apply: Put the letters from 'A' to 'D' into the fields of the diagramm. Same letters may not be horizontally or vertically adjacent. The numbers at the borders tell you the number of occurences of the corresponding letter in that row or column.
Additionally, the numbers at the borders have been replaced with letters. Same digits with same letters, different digits with different letters.