**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.