procedure main(arg)
	write( i := 0 to 9 & j := 0 to 9 & i+j=12 & j )	
	write( i := 0 to 9,  j := 0 to 9,  i+j=12,  j )
	write( (-1)( i := 0 to 9,  j := 0 to 9,  i+j=12,  j ) )
end