while true
begin
s = gets.split
rescue
break
end
n = x[0].to_i
s = x[1].to_i
if n*9>=s
if s%9==0
puts s/9*"9" + (n-(s/9))*"0"
else
puts s/9*"9" + str(s%9) + (n-(s/9+1))*"0"
end
else
puts "-"
end
end
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