The long A is provided by the vowel pair AI (pain). The G is silent.
In the word "plight," the letters "i" and "g" have the long "i" sound.
The letters OA make the long O sound in goal
The letter Y has a long I sound in typhoon. (The same is true of the word typhoid.)
The second A has a long A sound. In the homophone "aweigh" it is the EIGH or more specifically the EI that has the long A sound.
The letters U and Y together make the vowel sound. By itself, Y usually has the sound of a long I, but in this case the word buy has collected a U from its Middle English form bycgan and is differentiated from the homophone word , which is by.
Munch!
OO
oa
The letters "ee" are used when the sound is a long "e" as in "bee" or "see." The letters "ea" are used when the sound is a long "e" as in "beach" or "teach."
Pigeon
The word break has a long A sound from the EA pair, pronounced the same as "brake."
Those letters spell campaign.