Roman Numeral Conversion (NR) 
The NR conversion code transforms a numeric value to or from Roman numeral notation.
The full format of this conversion code is
NR
The NR conversion code used as a output conversion transforms a numeric value to Roman numeral notation. A value of zero will be transformed to "N" in accordance with practice introduced around 725AD. Other positive values will be formed using the M, D, C, L, X, V and I symbols. Note that numbers over 4999 will have a long sequence of leading M characters.
Negative values will cause the output conversion to fail.
Used as an input conversion, the NR code transforms a number from Roman numeral notation.
Examples (Output conversion)
