What are the 56 Telugu letters?

There is a misunderstanding. Telugu doesn't have 56 letters. It has 16 vowels and 36 consonants which makes a total of 52 letters.

Here is a breakdown:

Vowels:

* Basic Vowels: అ (a), ఆ (ā), ఇ (i), ఈ (ī), ఉ (u), ఊ (ū), ఋ (ṛ), ౠ (ṝ), ఌ (l̥), ౡ (l̥̄), ఎ (e), ఏ (ē), ఐ (ai), ఒ (o), ఓ (ō), औ (au)

Consonants:

* K-varga: క (ka), ఖ (kha), గ (ga), ఘ (gha), ఙ (ṅa)

* C-varga: చ (ca), ఛ (cha), జ (ja), ఝ (jha), ఞ (ña)

* T-varga: ట (ṭa), ఠ (ṭha), డ (ḍa), ఢ (ḍha), ణ (ṇa)

* T-varga: త (ta), థ (tha), ద (da), ధ (dha), న (na)

* P-varga: ప (pa), ఫ (pha), బ (ba), భ (bha), మ (ma)

* Y-varga: య (ya), ర (ra), ల (la), వ (va), శ (śa)

* S-varga: ష (ṣa), స (sa), హ (ha)

* Other Consonants: క్ష (kṣa), జ్ఞ (jña)

Let me know if you have any further questions!