Definition: In this task, you are given a tuple, comprising Head and Tail, separated with <sep>. The Head and the Tail events are short phrases possibly involving participants. The names of specific people have been replaced by generic words (e.g., PersonX, PersonY, PersonZ). PersonX is always the subject of the event. You have to determine whether, as a result of the Head, PersonY or others will be affected as mentioned in the Tail or not. These effects are social actions that may occur after the Head event. For example, X may get hugged, and Y may blush in response. Classify your answers into "Yes" and "No". The phrase may also contain "___", a placeholder that can be an object, a person, and/or an action.

Positive Example 1 -
Input: Head: PersonX goes the way of the dodo<sep>Tail: none
Output: Yes

Positive Example 2 -
Input: Head: PersonX applies sunscreen<sep>Tail: safe
Output: No

Negative Example 1 -
Input: Head: PersonX affords another ___<sep>Tail: to enjoy it
Output: Yes

Negative Example 2 -
Input: Head: PersonX invites PersonY to join PersonZ<sep>Tail: they get joined by PersonY
Output: No

Now complete the following example -
Input: Head: PersonX leads to PersonY understanding<sep>Tail: is grateful to personX

Output: Yes