Read the nine character

How can i do for read the nine character of this sentence that is the variale
this sentence it´s transmited to arduino for serial port
$ASTEER,70,1000
$ASTEER,174,1000
thank you

Store the serial port output in char array, then you can access any character you want

Or read 8 characters, throw them away then read another one and save it in a variable. It depends whether you want the whole sentence for something else or just the 9th character.