Solitary Solution Settlement (Posted on 2011-03-02)

(I) In this alphametic, each capital letter represents a different base eleven digit from 0 to A, where none of the numbers can contain any leading zero.

STORY = FROM + STAR

Determine the value of Y for which the above equation has precisely one solution.

(II) In this alphametic, each capital letter represents a different base ten digit from 0 to 9, where none of the numbers can contain any leading zero.

WE + TO + WEE + WORD = THINK

Determine the value of D for which the above equation has precisely one solution.