#	open(in, "input.txt");
#	open(out, ">output.txt");
	
#	$_=<in>;
#	local $/;
#	$_=<in>;

	$_=<STDIN>;
	local $/;
	$_=<STDIN>;
	
	s/(ch|[xso])$/$1es/gm;
	s/y$/ies/gm;
	s/fe?$/ves/gm;
	s/(?<!s)$/s/gm;
	
#	print out $_;
	print $_;
	
#	close in;
#	close out;