calc, 93 bytes

Result

WA

Duration

1701ms

Code [DL]

=REPT(LEFT(a1;51);B2/51)&LEFT(a1;MOD(B2;51))&REPT(B3;MOD(FIND(A3;A1)-B2;51)),=FIND(B3;A1)
T,K

stdin

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                        K                         

stdout

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                         KKKKKKKK

stderr

javaldx: Could not find a Java Runtime Environment!
Warning: failed to read path from javaldx
convert /tmp/code.csv -> /tmp/out/code.csv using filter : Text - txt - csv (StarCalc)

strace