On a chessboard, positions are marked with letters between a and h for the column and a number between 1 and 8 for the row. the first place on the board, a1, is black. the next is white, alternating across a row. odd rows start with black, even rows start with white. given a 2 character input string with a letter (a-h) and a number (1-8), print "black" or "white" indicating if the square is black or white. use if-else statements only. can you also explain how you got the code?

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.