Roman Numerals

Description

Convert number to Roman numerals

Specification	Input	Output
Convert number to symbol	Input [1,5,10,50,100,500,1000]	Output [I,V,X,L,C,D,M]
If symbol is next to same symbol, add them, unless they add up to next symbol denomination	Input [2,200,2000, 100]	Output [II,CC,MM,C(not LL)]
Same symbols cannot be more than 3 in a row	Input [IIII, CCCC, MMMM]	Not Valid
If symbol is preceded by a lesser value symbol, subtract lesser symbol from greater value symbol it precedes	Input [IV, IX, XIV]	Output [4, 9, 14]
Convert single digit numbers	Input [1,2,4,5,9]	Output [I, II, IV,V,IX]
Convert multi-digit numbers	Input [20, 40, 90]	Output [XX, XL, XC]