$ cat input.txt

**************************
*S* *                    *
* * *  *  *************  *
* *   *    ************  *
*    *                   *
************** ***********
*                        *
** ***********************
*      *              G  *
*  *      *********** *  *
*    *        ******* *  *
*       *                *
**************************

$ time ./run < input.txt

**************************
*S* *$$$$$               *
*$* *$ * $*************  *
*$*$$$*  $$************  *
*$$$ *    $$$$$          *
**************$***********
* $$$$$$$$$$$$$          *
**$***********************
* $$$$$*$$$$$$$$$$$$$$G  *
*  *  $$$ *********** *  *
*    *        ******* *  *
*       *                *
**************************

real	0m0.129s
user	0m0.124s
sys	0m0.000s