calc, 115 bytes

Result

WA

Duration

1679ms

Code [DL]

=REPT(LEFT(A1;51);B2-1)&REPT(C3;MOD(C2;51))&REPT(B3;MOD(D2-C2;51)),=(LEN(A1)+1)/51,=FIND(B3;A1)-1,=FIND(A3;A1)
T,K,

stdin

                             T                    
                                                  
                                                  
                                                  
             K                                    

stdout

                             T                    
                             T                    
                             T                    
                             T                    
KKKKKKKKKKKKKKKKK

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