Complete the function follow(s) which, for a given string (containing only the letters 'f', 'b', 'l', 'r'), calculates the final position according to the following rule:
  • The letter 'f' indicates to move forward by (0,1),
  • The letter 'b' indicates to move backward by (0,-1),
  • The letter 'l' indicates to move left by (-1,0),
  • The letter 'r' indicates to move right by (1,0).
Example: consider the initial position at point (0,0). If your list of instructions is 'fflff', then you should move forward twice, take a step to the left, then move forward again twice, and finally you will be at (-1, 4):
Other examples:
  • follow('ffrff') returns (1,4)
  • follow('fblr') returns (0,0)
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