2D Array Row Sums

Read a 3×3 matrix of integers, entered row by row (9 values in total). For each row, output the sum of that row's three values, one sum per line.

Input: 9 integers in row-major order (3 values per row, 3 rows). Output: Three integers — the sum of row 1, row 2, and row 3.

Example:

Input:  1 2 3     (row 1)
        4 5 6     (row 2)
        7 8 9     (row 3)
Output: 6
        15
        24

(Enter all 9 values one per line)