unittest
{
	assert( [ "sardine" ].parse.expand.solve == "xxxxxxx" );
	assert( [ "xxxx" ].parse.expand.solve == "xxxx" );
	assert( [ "gone" ].parse.expand.solve == "xxxx" );
}



import std.conv;
import std.range;
import std.stdio;
import std.typecons;

void main()
{
	stdin.byLineCopy.parse.expand.solve.writeln;
}

auto parse( Range )( Range input )
if( isInputRange!Range && is( ElementType!Range == string ) )
{
	auto s = input.front.to!( dchar[] );
	return tuple( s );
}

auto solve( dchar[] s )
{
	return 'x'.repeat( s.length ).array;
}
