Cross Sums

Cross Sums is a type of sum puzzle and a simulation of crossword puzzles.
Digital simulation:It is necessary to fill in the blank squares with numbers 1 to 9. The top number in a colored square containing numbers represents the sum of the numbers in the white square to the right of the square, while the bottom number in the colored square represents the sum of the numbers in the white square below the square. For example, the number "6" is the sum of 1+5 or 2+4; Do not fill in the same number (3+3).
Alphabet simulation:The letters a to i need to be filled into the blank squares. The upper letters in a colored square containing letters represent the sum of letters in the white square to the right of the square, while the lower letters in the colored square represent the sum of letters in the white square below the square. For example, the number "f" is the sum of a+e or b+d; Do not fill in the same letter (c+c).