csharp-dotnet, 129 bytes

Result

AC

Duration

5828ms

Code [DL]

using C=System.Console;class I{static void Main(){for(int c,x=0;(c=C.Read())>0;C.Write(x<1?'#':(char)c))x=c>83?0:-~x%51-c%2*51;}}

stdin

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                       K                          

stdout

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                       ###################        

stderr

The template "Console Application" was created successfully.

Processing post-creation actions...
Running 'dotnet restore' on /tmp/Proj/Proj.csproj...
  Restoring packages for /tmp/Proj/Proj.csproj...
  Generating MSBuild file /tmp/Proj/obj/Proj.csproj.nuget.g.props.
  Generating MSBuild file /tmp/Proj/obj/Proj.csproj.nuget.g.targets.
  Restore completed in 214.28 ms for /tmp/Proj/Proj.csproj.

Restore succeeded.

strace