Create 2965_pilot

A classical problem，even times means no effect on board， if turn the piece at coordinate row x and column y，
you can find only one piece at coordinate（x.y） will turn odd times，the other of row x and column y will turn even times；
it's the key point；base on this we can define a 2 dimensions array of type bool，we initials flase；and if the input character is
‘+’ we turn the row and column once；after enumerate the input string we can get the resualt；
base on the resualt we can list step ；the values true of bool type array means the step；
no matter which U turn first base on the bool type array the  resualt will be no effect，
so U can list the step from the top of the array to the tail which value is true；

pls pardon my poor English ，if  use the Chinese the text which i write will more smooth and easy understand，
but I wanna improve my ability of English  so i choose use English ；