[Check-IO] Follow Instructions

[1] Problems: https://py.checkio.org/en/mission/follow-instructions/
[2] My solutions 

def follow(instructions: str) -> Tuple[int, int]:
    # your code here
    f = instructions.count('f')
    b = instructions.count('b')
    l = instructions.count('l')
    r = instructions.count('r')
 
    return (- l + r, -b +f )

[3] Good solutions

def follow(instructions):
    c = instructions.count
    return c('r') - c('l'), c('f') - c('b')