Find the missing letter in the duck parade!

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Balls on cola bottles!
Bunnies Love Ice Cream
Alligator Arithmetic Adventure
These bears are ready to dance.
Shape Friends Unite!
Duck, Duck, Fun!
Rainbow Ice Cream Party!
Rainbow of Silly Colors!
Hop on to the Rainbow School Bus!
How Did This Frog Get So Big?
Make brushing time fun!
Smiley Eggs, Hidden Fun Inside
Crossing safely at the traffic light
Smiles brighter than sunshine
Shark Balls Fun!
Which Egg is the Silliest?
Who’s in charge on the farm?
Amazing Cake Party with Animal Friends
The Green Alien Isn’t Sure About These Green Treats!
Spidey dance party goes colorful