ACSL Tiles is a one$-$person game played with rectangular tiles. Each tile has a single$-$digit number between $1$ and $9$ inclusive at each end. At the start of the game, there are $4$ rows, each with a number. The goal of the game is to build rows by placing a tile at the right end of a row whose last number matches a number on the tile. Tiles can be re$-$oriented; thus, the tiles $34$ and $43$ are the same tile. If a tile cannot be placed on any row, it is placed in the discard pile. When all tiles have been played or discarded, find the sum of the single$-$digit numbers on all of the tiles in this discard pile.

At each turn, try the next tile in your hand to see if it can be added to one of the rows, starting with the row after the one where the last tile was placed, rotating back to Row $1$ if necessary. Start looking at Row $1$ when the game starts. However, if the last tile placed was a double $($i$.$e$.,$ both numbers are the same$),$ another tile must be placed on that row before any other match can be considered. If the tile cannot be placed, add it to the discard pile.

Input:

$5923$

$5627733499453219645718$

Output:

$21$

Explanation:

The game starts with $4$ rows having numbers $5,9,2,3.$

The tile $56$ is placed on Row $1$; the tile $27$ is placed on Row $3$; the tile $73$ is placed on Row $4$ as $37$ because Row $4$ is checked first after a tile is placed on Row $3$; the tile $34$ is placed on the discard pile; the tile $99$ is placed on Row $2$

The $45$ and the $32$ tiles are placed in the discard pile because they don't match the $99$ tile; the tile $19$ is placed on Row $2$ as $91$; the tile $64$ is placed on Row $1$; the $57$ is placed on Row $3$ as $75$; and the $18$ is placed on Row $2.$

The final outcome is shown below:

The sum of the single$-$digit numbers on the tiles in the

discard pile is $3+4+4+5+3+2=21.$

TASK:

Complete the function findDiscardSum

$$ The function has two parameters: a $4-$digit integer, originalRows, representing the initial numbers from Row $1$ to Row $4$ and a string of $2-$digit numbers, tiles, each separated by a single space. Each $2-$digit number represents the two numbers on each tile, both between $1$ and $9,$ inclusive.

$$ The function returns an integer representing the sum of all of the single$-$digit numbers on the tiles in the discard pile.

You may create additional functions that are called from findDiscardSum if needed in solving the problem.