a2r(a)=
r = ""
n = [["M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"],[1000,900,500,400,100,90,50,40,10,9,5,4,1]]
> i, 1..13
> a!<n[i,2]
r += n[i,1]
a -= n[i,2]
<
<= r
.
t = [1990,2008,1666]
> i, 1..#.size(t,1)
#.output(t[i]," = ",a2r(t[i]))