How do you switch from lowercase to uppercase?
Passwords must contain at least one uppercase letter, one lowercase letter and a number.
Is your email address in all lowercase letters? Is it really? Are you crazy?
You know that 文字 means "letters". So, what are "small letters"? That would be lowercase letters.
The reading for 小 is an exceptional reading. You know it means "small," so think about what else is small: a child. How do you say "child" in Japanese? こ. You also know how to say the 文字 portion from the previous level, so combine those together and you have こもじ.