In a certain code language, 'MOST' is written as '134' and 'FUR' is written as '90'. How will 'SUCCESS' be written in that language?

178

1   2    3    4   5    6   7     8    9  10  11  12  13

 A   B   C    D   E    F   G    H    I    J    K    L   M

 ↓    ↓    ↓    ↓    ↓     ↓   ↓    ↓     ↓   ↓    ↓    ↓    ↓

 Z   Y    X   W   V    U   T    S    R   Q   P    O   N

26  25  24  23  22  21  20  19  18  17  16  15  14

The logic;

(addition of letter's positional value x2)

 'MOST' is written as '134',

=> 13+15+19+20 x2

=> 134

And, 

'FUR' is written as '90',

=> 6+21+18 x2

=> 90

Similarly,

'SUCCESS' be written ...?

=> 19+21+3+3+5+19+19 x2

=> 178