d-gdc, 145 bytes

Result

AC

Duration

1022ms

Code [DL]

import std.stdio;void main(){int b=0;char[]c,d,e;for(c=readln.dup;e=readln.dup,e;d=e)write(c);for(;d[++b]-75;){}for(;c[b]-84;)++c[b++];write(c);}

stdin

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     K                                            

stdout

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     !!!!!T                                       

stderr

strace