The alphabets are coded as shown below :
 

M	I	N	J	U	R	T	A	D
3	1	2	5	4	7	6	8	9

i.e. M is coded as 3,
A as 8,
D as 9,
U as 4,
R as 7  and
I as 1.
So, MADURAI is coded as 3894781.