rail, 128 bytes

Result

AC

Duration

1434ms

Code [DL]

$'main'
 -10{f}
$'f'
 -(!!)(!d!)1i(!c!)(c)[T]qs(d)m(!d!)(c)[K]q()(d)ma(!!)[x](c)p111()ads(!!)1()s(d)m0gc1c(!f!)o(d)1a96m3sr(){f}

stdin

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             K                                    

stdout

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             xxxxxx                               

stderr

Crash: A read was attempted when there is no more inputIndex Out Of Bounds for the 'cut' command

strace