Row Totals By Hand

The grid matrix has three rows of three integers: declare the first two rows as [3, 8, 1] and [7, 2, 9], and read the three values of the last row from input(), one per line with no prompts. Using a for loop over the rows and a second for loop inside it over the values of each row, add up each row by hand (no sum()) and print Row total: <n> for every row in order, then print Grand total: <n> once, the sum of all nine values, accumulated in a variable called grand_total. Input: three integers.