d-gdc, 110 bytes

Result

AC

Duration

807ms

Code [DL]

import std.stdio;void main(){int b,c,d=1;for(;~(c=getchar());d=++d%51)d*=c!=84,b=c&1|b&&d,putchar(!d|b?99:c);}

stdin

                                               T  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                          K       

stdout

                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                               c  
                                          cccccc  

stderr

strace