If 2 is added to all the odd place digits and 1 is subtracted from all even place digits (from the left end) in ‘634715247’ and then all the digits are arranged in descending order from left to right. Which is the seventh digit from the left end after the rearrangement? ( Note : Here, place value of ‘6’ is 1, place value of ‘3’ is 2, place value of ‘4’ is 3, and so on).