Okay, we are tasked with adding 199436388 and 145119519. Let's begin!

Step 1: We'll start by adding the digits 8 & 9 in column 1 and get 17.
We'll write down the last digit 7 and carry the 1 to the next column.

Step 2: We'll start by adding the digits 8 & 1 in column 2 and get 10.
We'll write down the last digit 0 and carry the 1 to the next column.

Step 3: We'll start by adding the digits 3 & 5 in column 3 and get 9.

Step 4: We'll start by adding the digits 6 & 9 in column 4 and get 15.
We'll write down the last digit 5 and carry the 1 to the next column.

Step 5: We'll start by adding the digits 3 & 1 in column 5 and get 5.

Step 6: We'll start by adding the digits 4 & 1 in column 6 and get 5.

Step 7: We'll start by adding the digits 9 & 5 in column 7 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

Step 8: We'll start by adding the digits 9 & 4 in column 8 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

Step 9: We'll start by adding the digits 1 & 1 in column 9 and get 3.

So, 199436388 + 145119519 = 344555907.

